Rename directories for some crates from `syntax_x` to `rustc_x`

`syntax_expand` -> `rustc_expand`
`syntax_pos` -> `rustc_span`
`syntax_ext` -> `rustc_builtin_macros`

1 files changed, 0 insertions, 1672 deletions

diff --git a/src/libsyntax_pos/lib.rs b/src/libsyntax_pos/lib.rs
deleted file mode 100644
index a58c12f2350..00000000000
--- a/src/libsyntax_pos/lib.rs
+++ /dev/null
@@ -1,1672 +0,0 @@
-//! The source positions and related helper functions.
-//!
-//! ## Note
-//!
-//! This API is completely unstable and subject to change.
-
-#![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![feature(const_fn)]
-#![feature(crate_visibility_modifier)]
-#![feature(nll)]
-#![feature(optin_builtin_traits)]
-#![feature(rustc_attrs)]
-#![feature(specialization)]
-#![feature(step_trait)]
-
-use rustc_data_structures::AtomicRef;
-use rustc_macros::HashStable_Generic;
-use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
-
-mod caching_source_map_view;
-pub mod source_map;
-pub use self::caching_source_map_view::CachingSourceMapView;
-
-pub mod edition;
-use edition::Edition;
-pub mod hygiene;
-use hygiene::Transparency;
-pub use hygiene::{DesugaringKind, ExpnData, ExpnId, ExpnKind, MacroKind, SyntaxContext};
-
-mod span_encoding;
-pub use span_encoding::{Span, DUMMY_SP};
-
-pub mod symbol;
-pub use symbol::{sym, Symbol};
-
-mod analyze_source_file;
-pub mod fatal_error;
-
-use rustc_data_structures::fingerprint::Fingerprint;
-use rustc_data_structures::fx::FxHashMap;
-use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
-use rustc_data_structures::sync::{Lock, Lrc};
-
-use std::borrow::Cow;
-use std::cell::RefCell;
-use std::cmp::{self, Ordering};
-use std::fmt;
-use std::hash::{Hash, Hasher};
-use std::ops::{Add, Sub};
-use std::path::PathBuf;
-
-#[cfg(test)]
-mod tests;
-
-pub struct Globals {
-    symbol_interner: Lock<symbol::Interner>,
-    span_interner: Lock<span_encoding::SpanInterner>,
-    hygiene_data: Lock<hygiene::HygieneData>,
-}
-
-impl Globals {
-    pub fn new(edition: Edition) -> Globals {
-        Globals {
-            symbol_interner: Lock::new(symbol::Interner::fresh()),
-            span_interner: Lock::new(span_encoding::SpanInterner::default()),
-            hygiene_data: Lock::new(hygiene::HygieneData::new(edition)),
-        }
-    }
-}
-
-scoped_tls::scoped_thread_local!(pub static GLOBALS: Globals);
-
-/// Differentiates between real files and common virtual files.
-#[derive(
-    Debug,
-    Eq,
-    PartialEq,
-    Clone,
-    Ord,
-    PartialOrd,
-    Hash,
-    RustcDecodable,
-    RustcEncodable,
-    HashStable_Generic
-)]
-pub enum FileName {
-    Real(PathBuf),
-    /// A macro. This includes the full name of the macro, so that there are no clashes.
-    Macros(String),
-    /// Call to `quote!`.
-    QuoteExpansion(u64),
-    /// Command line.
-    Anon(u64),
-    /// Hack in `src/libsyntax/parse.rs`.
-    // FIXME(jseyfried)
-    MacroExpansion(u64),
-    ProcMacroSourceCode(u64),
-    /// Strings provided as `--cfg [cfgspec]` stored in a `crate_cfg`.
-    CfgSpec(u64),
-    /// Strings provided as crate attributes in the CLI.
-    CliCrateAttr(u64),
-    /// Custom sources for explicit parser calls from plugins and drivers.
-    Custom(String),
-    DocTest(PathBuf, isize),
-}
-
-impl std::fmt::Display for FileName {
-    fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        use FileName::*;
-        match *self {
-            Real(ref path) => write!(fmt, "{}", path.display()),
-            Macros(ref name) => write!(fmt, "<{} macros>", name),
-            QuoteExpansion(_) => write!(fmt, "<quote expansion>"),
-            MacroExpansion(_) => write!(fmt, "<macro expansion>"),
-            Anon(_) => write!(fmt, "<anon>"),
-            ProcMacroSourceCode(_) => write!(fmt, "<proc-macro source code>"),
-            CfgSpec(_) => write!(fmt, "<cfgspec>"),
-            CliCrateAttr(_) => write!(fmt, "<crate attribute>"),
-            Custom(ref s) => write!(fmt, "<{}>", s),
-            DocTest(ref path, _) => write!(fmt, "{}", path.display()),
-        }
-    }
-}
-
-impl From<PathBuf> for FileName {
-    fn from(p: PathBuf) -> Self {
-        assert!(!p.to_string_lossy().ends_with('>'));
-        FileName::Real(p)
-    }
-}
-
-impl FileName {
-    pub fn is_real(&self) -> bool {
-        use FileName::*;
-        match *self {
-            Real(_) => true,
-            Macros(_)
-            | Anon(_)
-            | MacroExpansion(_)
-            | ProcMacroSourceCode(_)
-            | CfgSpec(_)
-            | CliCrateAttr(_)
-            | Custom(_)
-            | QuoteExpansion(_)
-            | DocTest(_, _) => false,
-        }
-    }
-
-    pub fn is_macros(&self) -> bool {
-        use FileName::*;
-        match *self {
-            Real(_)
-            | Anon(_)
-            | MacroExpansion(_)
-            | ProcMacroSourceCode(_)
-            | CfgSpec(_)
-            | CliCrateAttr(_)
-            | Custom(_)
-            | QuoteExpansion(_)
-            | DocTest(_, _) => false,
-            Macros(_) => true,
-        }
-    }
-
-    pub fn quote_expansion_source_code(src: &str) -> FileName {
-        let mut hasher = StableHasher::new();
-        src.hash(&mut hasher);
-        FileName::QuoteExpansion(hasher.finish())
-    }
-
-    pub fn macro_expansion_source_code(src: &str) -> FileName {
-        let mut hasher = StableHasher::new();
-        src.hash(&mut hasher);
-        FileName::MacroExpansion(hasher.finish())
-    }
-
-    pub fn anon_source_code(src: &str) -> FileName {
-        let mut hasher = StableHasher::new();
-        src.hash(&mut hasher);
-        FileName::Anon(hasher.finish())
-    }
-
-    pub fn proc_macro_source_code(src: &str) -> FileName {
-        let mut hasher = StableHasher::new();
-        src.hash(&mut hasher);
-        FileName::ProcMacroSourceCode(hasher.finish())
-    }
-
-    pub fn cfg_spec_source_code(src: &str) -> FileName {
-        let mut hasher = StableHasher::new();
-        src.hash(&mut hasher);
-        FileName::QuoteExpansion(hasher.finish())
-    }
-
-    pub fn cli_crate_attr_source_code(src: &str) -> FileName {
-        let mut hasher = StableHasher::new();
-        src.hash(&mut hasher);
-        FileName::CliCrateAttr(hasher.finish())
-    }
-
-    pub fn doc_test_source_code(path: PathBuf, line: isize) -> FileName {
-        FileName::DocTest(path, line)
-    }
-}
-
-/// Spans represent a region of code, used for error reporting. Positions in spans
-/// are *absolute* positions from the beginning of the source_map, not positions
-/// relative to `SourceFile`s. Methods on the `SourceMap` can be used to relate spans back
-/// to the original source.
-/// You must be careful if the span crosses more than one file - you will not be
-/// able to use many of the functions on spans in source_map and you cannot assume
-/// that the length of the `span = hi - lo`; there may be space in the `BytePos`
-/// range between files.
-///
-/// `SpanData` is public because `Span` uses a thread-local interner and can't be
-/// sent to other threads, but some pieces of performance infra run in a separate thread.
-/// Using `Span` is generally preferred.
-#[derive(Clone, Copy, Hash, PartialEq, Eq, Ord, PartialOrd)]
-pub struct SpanData {
-    pub lo: BytePos,
-    pub hi: BytePos,
-    /// Information about where the macro came from, if this piece of
-    /// code was created by a macro expansion.
-    pub ctxt: SyntaxContext,
-}
-
-impl SpanData {
-    #[inline]
-    pub fn with_lo(&self, lo: BytePos) -> Span {
-        Span::new(lo, self.hi, self.ctxt)
-    }
-    #[inline]
-    pub fn with_hi(&self, hi: BytePos) -> Span {
-        Span::new(self.lo, hi, self.ctxt)
-    }
-    #[inline]
-    pub fn with_ctxt(&self, ctxt: SyntaxContext) -> Span {
-        Span::new(self.lo, self.hi, ctxt)
-    }
-}
-
-// The interner is pointed to by a thread local value which is only set on the main thread
-// with parallelization is disabled. So we don't allow `Span` to transfer between threads
-// to avoid panics and other errors, even though it would be memory safe to do so.
-#[cfg(not(parallel_compiler))]
-impl !Send for Span {}
-#[cfg(not(parallel_compiler))]
-impl !Sync for Span {}
-
-impl PartialOrd for Span {
-    fn partial_cmp(&self, rhs: &Self) -> Option<Ordering> {
-        PartialOrd::partial_cmp(&self.data(), &rhs.data())
-    }
-}
-impl Ord for Span {
-    fn cmp(&self, rhs: &Self) -> Ordering {
-        Ord::cmp(&self.data(), &rhs.data())
-    }
-}
-
-/// A collection of spans. Spans have two orthogonal attributes:
-///
-/// - They can be *primary spans*. In this case they are the locus of
-///   the error, and would be rendered with `^^^`.
-/// - They can have a *label*. In this case, the label is written next
-///   to the mark in the snippet when we render.
-#[derive(Clone, Debug, Hash, PartialEq, Eq, RustcEncodable, RustcDecodable)]
-pub struct MultiSpan {
-    primary_spans: Vec<Span>,
-    span_labels: Vec<(Span, String)>,
-}
-
-impl Span {
-    #[inline]
-    pub fn lo(self) -> BytePos {
-        self.data().lo
-    }
-    #[inline]
-    pub fn with_lo(self, lo: BytePos) -> Span {
-        self.data().with_lo(lo)
-    }
-    #[inline]
-    pub fn hi(self) -> BytePos {
-        self.data().hi
-    }
-    #[inline]
-    pub fn with_hi(self, hi: BytePos) -> Span {
-        self.data().with_hi(hi)
-    }
-    #[inline]
-    pub fn ctxt(self) -> SyntaxContext {
-        self.data().ctxt
-    }
-    #[inline]
-    pub fn with_ctxt(self, ctxt: SyntaxContext) -> Span {
-        self.data().with_ctxt(ctxt)
-    }
-
-    /// Returns `true` if this is a dummy span with any hygienic context.
-    #[inline]
-    pub fn is_dummy(self) -> bool {
-        let span = self.data();
-        span.lo.0 == 0 && span.hi.0 == 0
-    }
-
-    /// Returns `true` if this span comes from a macro or desugaring.
-    #[inline]
-    pub fn from_expansion(self) -> bool {
-        self.ctxt() != SyntaxContext::root()
-    }
-
-    #[inline]
-    pub fn with_root_ctxt(lo: BytePos, hi: BytePos) -> Span {
-        Span::new(lo, hi, SyntaxContext::root())
-    }
-
-    /// Returns a new span representing an empty span at the beginning of this span
-    #[inline]
-    pub fn shrink_to_lo(self) -> Span {
-        let span = self.data();
-        span.with_hi(span.lo)
-    }
-    /// Returns a new span representing an empty span at the end of this span.
-    #[inline]
-    pub fn shrink_to_hi(self) -> Span {
-        let span = self.data();
-        span.with_lo(span.hi)
-    }
-
-    /// Returns `self` if `self` is not the dummy span, and `other` otherwise.
-    pub fn substitute_dummy(self, other: Span) -> Span {
-        if self.is_dummy() { other } else { self }
-    }
-
-    /// Returns `true` if `self` fully encloses `other`.
-    pub fn contains(self, other: Span) -> bool {
-        let span = self.data();
-        let other = other.data();
-        span.lo <= other.lo && other.hi <= span.hi
-    }
-
-    /// Returns `true` if `self` touches `other`.
-    pub fn overlaps(self, other: Span) -> bool {
-        let span = self.data();
-        let other = other.data();
-        span.lo < other.hi && other.lo < span.hi
-    }
-
-    /// Returns `true` if the spans are equal with regards to the source text.
-    ///
-    /// Use this instead of `==` when either span could be generated code,
-    /// and you only care that they point to the same bytes of source text.
-    pub fn source_equal(&self, other: &Span) -> bool {
-        let span = self.data();
-        let other = other.data();
-        span.lo == other.lo && span.hi == other.hi
-    }
-
-    /// Returns `Some(span)`, where the start is trimmed by the end of `other`.
-    pub fn trim_start(self, other: Span) -> Option<Span> {
-        let span = self.data();
-        let other = other.data();
-        if span.hi > other.hi { Some(span.with_lo(cmp::max(span.lo, other.hi))) } else { None }
-    }
-
-    /// Returns the source span -- this is either the supplied span, or the span for
-    /// the macro callsite that expanded to it.
-    pub fn source_callsite(self) -> Span {
-        let expn_data = self.ctxt().outer_expn_data();
-        if !expn_data.is_root() { expn_data.call_site.source_callsite() } else { self }
-    }
-
-    /// The `Span` for the tokens in the previous macro expansion from which `self` was generated,
-    /// if any.
-    pub fn parent(self) -> Option<Span> {
-        let expn_data = self.ctxt().outer_expn_data();
-        if !expn_data.is_root() { Some(expn_data.call_site) } else { None }
-    }
-
-    /// Edition of the crate from which this span came.
-    pub fn edition(self) -> edition::Edition {
-        self.ctxt().outer_expn_data().edition
-    }
-
-    #[inline]
-    pub fn rust_2015(&self) -> bool {
-        self.edition() == edition::Edition::Edition2015
-    }
-
-    #[inline]
-    pub fn rust_2018(&self) -> bool {
-        self.edition() >= edition::Edition::Edition2018
-    }
-
-    /// Returns the source callee.
-    ///
-    /// Returns `None` if the supplied span has no expansion trace,
-    /// else returns the `ExpnData` for the macro definition
-    /// corresponding to the source callsite.
-    pub fn source_callee(self) -> Option<ExpnData> {
-        fn source_callee(expn_data: ExpnData) -> ExpnData {
-            let next_expn_data = expn_data.call_site.ctxt().outer_expn_data();
-            if !next_expn_data.is_root() { source_callee(next_expn_data) } else { expn_data }
-        }
-        let expn_data = self.ctxt().outer_expn_data();
-        if !expn_data.is_root() { Some(source_callee(expn_data)) } else { None }
-    }
-
-    /// Checks if a span is "internal" to a macro in which `#[unstable]`
-    /// items can be used (that is, a macro marked with
-    /// `#[allow_internal_unstable]`).
-    pub fn allows_unstable(&self, feature: Symbol) -> bool {
-        self.ctxt().outer_expn_data().allow_internal_unstable.map_or(false, |features| {
-            features
-                .iter()
-                .any(|&f| f == feature || f == sym::allow_internal_unstable_backcompat_hack)
-        })
-    }
-
-    /// Checks if this span arises from a compiler desugaring of kind `kind`.
-    pub fn is_desugaring(&self, kind: DesugaringKind) -> bool {
-        match self.ctxt().outer_expn_data().kind {
-            ExpnKind::Desugaring(k) => k == kind,
-            _ => false,
-        }
-    }
-
-    /// Returns the compiler desugaring that created this span, or `None`
-    /// if this span is not from a desugaring.
-    pub fn desugaring_kind(&self) -> Option<DesugaringKind> {
-        match self.ctxt().outer_expn_data().kind {
-            ExpnKind::Desugaring(k) => Some(k),
-            _ => None,
-        }
-    }
-
-    /// Checks if a span is "internal" to a macro in which `unsafe`
-    /// can be used without triggering the `unsafe_code` lint
-    //  (that is, a macro marked with `#[allow_internal_unsafe]`).
-    pub fn allows_unsafe(&self) -> bool {
-        self.ctxt().outer_expn_data().allow_internal_unsafe
-    }
-
-    pub fn macro_backtrace(mut self) -> Vec<MacroBacktrace> {
-        let mut prev_span = DUMMY_SP;
-        let mut result = vec![];
-        loop {
-            let expn_data = self.ctxt().outer_expn_data();
-            if expn_data.is_root() {
-                break;
-            }
-            // Don't print recursive invocations.
-            if !expn_data.call_site.source_equal(&prev_span) {
-                let (pre, post) = match expn_data.kind {
-                    ExpnKind::Root => break,
-                    ExpnKind::Desugaring(..) => ("desugaring of ", ""),
-                    ExpnKind::AstPass(..) => ("", ""),
-                    ExpnKind::Macro(macro_kind, _) => match macro_kind {
-                        MacroKind::Bang => ("", "!"),
-                        MacroKind::Attr => ("#[", "]"),
-                        MacroKind::Derive => ("#[derive(", ")]"),
-                    },
-                };
-                result.push(MacroBacktrace {
-                    call_site: expn_data.call_site,
-                    macro_decl_name: format!("{}{}{}", pre, expn_data.kind.descr(), post),
-                    def_site_span: expn_data.def_site,
-                });
-            }
-
-            prev_span = self;
-            self = expn_data.call_site;
-        }
-        result
-    }
-
-    /// Returns a `Span` that would enclose both `self` and `end`.
-    pub fn to(self, end: Span) -> Span {
-        let span_data = self.data();
-        let end_data = end.data();
-        // FIXME(jseyfried): `self.ctxt` should always equal `end.ctxt` here (cf. issue #23480).
-        // Return the macro span on its own to avoid weird diagnostic output. It is preferable to
-        // have an incomplete span than a completely nonsensical one.
-        if span_data.ctxt != end_data.ctxt {
-            if span_data.ctxt == SyntaxContext::root() {
-                return end;
-            } else if end_data.ctxt == SyntaxContext::root() {
-                return self;
-            }
-            // Both spans fall within a macro.
-            // FIXME(estebank): check if it is the *same* macro.
-        }
-        Span::new(
-            cmp::min(span_data.lo, end_data.lo),
-            cmp::max(span_data.hi, end_data.hi),
-            if span_data.ctxt == SyntaxContext::root() { end_data.ctxt } else { span_data.ctxt },
-        )
-    }
-
-    /// Returns a `Span` between the end of `self` to the beginning of `end`.
-    pub fn between(self, end: Span) -> Span {
-        let span = self.data();
-        let end = end.data();
-        Span::new(
-            span.hi,
-            end.lo,
-            if end.ctxt == SyntaxContext::root() { end.ctxt } else { span.ctxt },
-        )
-    }
-
-    /// Returns a `Span` between the beginning of `self` to the beginning of `end`.
-    pub fn until(self, end: Span) -> Span {
-        let span = self.data();
-        let end = end.data();
-        Span::new(
-            span.lo,
-            end.lo,
-            if end.ctxt == SyntaxContext::root() { end.ctxt } else { span.ctxt },
-        )
-    }
-
-    pub fn from_inner(self, inner: InnerSpan) -> Span {
-        let span = self.data();
-        Span::new(
-            span.lo + BytePos::from_usize(inner.start),
-            span.lo + BytePos::from_usize(inner.end),
-            span.ctxt,
-        )
-    }
-
-    /// Equivalent of `Span::def_site` from the proc macro API,
-    /// except that the location is taken from the `self` span.
-    pub fn with_def_site_ctxt(self, expn_id: ExpnId) -> Span {
-        self.with_ctxt_from_mark(expn_id, Transparency::Opaque)
-    }
-
-    /// Equivalent of `Span::call_site` from the proc macro API,
-    /// except that the location is taken from the `self` span.
-    pub fn with_call_site_ctxt(&self, expn_id: ExpnId) -> Span {
-        self.with_ctxt_from_mark(expn_id, Transparency::Transparent)
-    }
-
-    /// Equivalent of `Span::mixed_site` from the proc macro API,
-    /// except that the location is taken from the `self` span.
-    pub fn with_mixed_site_ctxt(&self, expn_id: ExpnId) -> Span {
-        self.with_ctxt_from_mark(expn_id, Transparency::SemiTransparent)
-    }
-
-    /// Produces a span with the same location as `self` and context produced by a macro with the
-    /// given ID and transparency, assuming that macro was defined directly and not produced by
-    /// some other macro (which is the case for built-in and procedural macros).
-    pub fn with_ctxt_from_mark(self, expn_id: ExpnId, transparency: Transparency) -> Span {
-        self.with_ctxt(SyntaxContext::root().apply_mark(expn_id, transparency))
-    }
-
-    #[inline]
-    pub fn apply_mark(self, expn_id: ExpnId, transparency: Transparency) -> Span {
-        let span = self.data();
-        span.with_ctxt(span.ctxt.apply_mark(expn_id, transparency))
-    }
-
-    #[inline]
-    pub fn remove_mark(&mut self) -> ExpnId {
-        let mut span = self.data();
-        let mark = span.ctxt.remove_mark();
-        *self = Span::new(span.lo, span.hi, span.ctxt);
-        mark
-    }
-
-    #[inline]
-    pub fn adjust(&mut self, expn_id: ExpnId) -> Option<ExpnId> {
-        let mut span = self.data();
-        let mark = span.ctxt.adjust(expn_id);
-        *self = Span::new(span.lo, span.hi, span.ctxt);
-        mark
-    }
-
-    #[inline]
-    pub fn modernize_and_adjust(&mut self, expn_id: ExpnId) -> Option<ExpnId> {
-        let mut span = self.data();
-        let mark = span.ctxt.modernize_and_adjust(expn_id);
-        *self = Span::new(span.lo, span.hi, span.ctxt);
-        mark
-    }
-
-    #[inline]
-    pub fn glob_adjust(&mut self, expn_id: ExpnId, glob_span: Span) -> Option<Option<ExpnId>> {
-        let mut span = self.data();
-        let mark = span.ctxt.glob_adjust(expn_id, glob_span);
-        *self = Span::new(span.lo, span.hi, span.ctxt);
-        mark
-    }
-
-    #[inline]
-    pub fn reverse_glob_adjust(
-        &mut self,
-        expn_id: ExpnId,
-        glob_span: Span,
-    ) -> Option<Option<ExpnId>> {
-        let mut span = self.data();
-        let mark = span.ctxt.reverse_glob_adjust(expn_id, glob_span);
-        *self = Span::new(span.lo, span.hi, span.ctxt);
-        mark
-    }
-
-    #[inline]
-    pub fn modern(self) -> Span {
-        let span = self.data();
-        span.with_ctxt(span.ctxt.modern())
-    }
-
-    #[inline]
-    pub fn modern_and_legacy(self) -> Span {
-        let span = self.data();
-        span.with_ctxt(span.ctxt.modern_and_legacy())
-    }
-}
-
-#[derive(Clone, Debug)]
-pub struct SpanLabel {
-    /// The span we are going to include in the final snippet.
-    pub span: Span,
-
-    /// Is this a primary span? This is the "locus" of the message,
-    /// and is indicated with a `^^^^` underline, versus `----`.
-    pub is_primary: bool,
-
-    /// What label should we attach to this span (if any)?
-    pub label: Option<String>,
-}
-
-impl Default for Span {
-    fn default() -> Self {
-        DUMMY_SP
-    }
-}
-
-impl rustc_serialize::UseSpecializedEncodable for Span {
-    fn default_encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
-        let span = self.data();
-        s.emit_struct("Span", 2, |s| {
-            s.emit_struct_field("lo", 0, |s| span.lo.encode(s))?;
-
-            s.emit_struct_field("hi", 1, |s| span.hi.encode(s))
-        })
-    }
-}
-
-impl rustc_serialize::UseSpecializedDecodable for Span {
-    fn default_decode<D: Decoder>(d: &mut D) -> Result<Span, D::Error> {
-        d.read_struct("Span", 2, |d| {
-            let lo = d.read_struct_field("lo", 0, Decodable::decode)?;
-            let hi = d.read_struct_field("hi", 1, Decodable::decode)?;
-            Ok(Span::with_root_ctxt(lo, hi))
-        })
-    }
-}
-
-pub fn default_span_debug(span: Span, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-    f.debug_struct("Span")
-        .field("lo", &span.lo())
-        .field("hi", &span.hi())
-        .field("ctxt", &span.ctxt())
-        .finish()
-}
-
-impl fmt::Debug for Span {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        (*SPAN_DEBUG)(*self, f)
-    }
-}
-
-impl fmt::Debug for SpanData {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        (*SPAN_DEBUG)(Span::new(self.lo, self.hi, self.ctxt), f)
-    }
-}
-
-impl MultiSpan {
-    #[inline]
-    pub fn new() -> MultiSpan {
-        MultiSpan { primary_spans: vec![], span_labels: vec![] }
-    }
-
-    pub fn from_span(primary_span: Span) -> MultiSpan {
-        MultiSpan { primary_spans: vec![primary_span], span_labels: vec![] }
-    }
-
-    pub fn from_spans(vec: Vec<Span>) -> MultiSpan {
-        MultiSpan { primary_spans: vec, span_labels: vec![] }
-    }
-
-    pub fn push_span_label(&mut self, span: Span, label: String) {
-        self.span_labels.push((span, label));
-    }
-
-    /// Selects the first primary span (if any).
-    pub fn primary_span(&self) -> Option<Span> {
-        self.primary_spans.first().cloned()
-    }
-
-    /// Returns all primary spans.
-    pub fn primary_spans(&self) -> &[Span] {
-        &self.primary_spans
-    }
-
-    /// Returns `true` if any of the primary spans are displayable.
-    pub fn has_primary_spans(&self) -> bool {
-        self.primary_spans.iter().any(|sp| !sp.is_dummy())
-    }
-
-    /// Returns `true` if this contains only a dummy primary span with any hygienic context.
-    pub fn is_dummy(&self) -> bool {
-        let mut is_dummy = true;
-        for span in &self.primary_spans {
-            if !span.is_dummy() {
-                is_dummy = false;
-            }
-        }
-        is_dummy
-    }
-
-    /// Replaces all occurrences of one Span with another. Used to move `Span`s in areas that don't
-    /// display well (like std macros). Returns whether replacements occurred.
-    pub fn replace(&mut self, before: Span, after: Span) -> bool {
-        let mut replacements_occurred = false;
-        for primary_span in &mut self.primary_spans {
-            if *primary_span == before {
-                *primary_span = after;
-                replacements_occurred = true;
-            }
-        }
-        for span_label in &mut self.span_labels {
-            if span_label.0 == before {
-                span_label.0 = after;
-                replacements_occurred = true;
-            }
-        }
-        replacements_occurred
-    }
-
-    /// Returns the strings to highlight. We always ensure that there
-    /// is an entry for each of the primary spans -- for each primary
-    /// span `P`, if there is at least one label with span `P`, we return
-    /// those labels (marked as primary). But otherwise we return
-    /// `SpanLabel` instances with empty labels.
-    pub fn span_labels(&self) -> Vec<SpanLabel> {
-        let is_primary = |span| self.primary_spans.contains(&span);
-
-        let mut span_labels = self
-            .span_labels
-            .iter()
-            .map(|&(span, ref label)| SpanLabel {
-                span,
-                is_primary: is_primary(span),
-                label: Some(label.clone()),
-            })
-            .collect::<Vec<_>>();
-
-        for &span in &self.primary_spans {
-            if !span_labels.iter().any(|sl| sl.span == span) {
-                span_labels.push(SpanLabel { span, is_primary: true, label: None });
-            }
-        }
-
-        span_labels
-    }
-
-    /// Returns `true` if any of the span labels is displayable.
-    pub fn has_span_labels(&self) -> bool {
-        self.span_labels.iter().any(|(sp, _)| !sp.is_dummy())
-    }
-}
-
-impl From<Span> for MultiSpan {
-    fn from(span: Span) -> MultiSpan {
-        MultiSpan::from_span(span)
-    }
-}
-
-impl From<Vec<Span>> for MultiSpan {
-    fn from(spans: Vec<Span>) -> MultiSpan {
-        MultiSpan::from_spans(spans)
-    }
-}
-
-/// Identifies an offset of a multi-byte character in a `SourceFile`.
-#[derive(Copy, Clone, RustcEncodable, RustcDecodable, Eq, PartialEq, Debug)]
-pub struct MultiByteChar {
-    /// The absolute offset of the character in the `SourceMap`.
-    pub pos: BytePos,
-    /// The number of bytes, `>= 2`.
-    pub bytes: u8,
-}
-
-/// Identifies an offset of a non-narrow character in a `SourceFile`.
-#[derive(Copy, Clone, RustcEncodable, RustcDecodable, Eq, PartialEq, Debug)]
-pub enum NonNarrowChar {
-    /// Represents a zero-width character.
-    ZeroWidth(BytePos),
-    /// Represents a wide (full-width) character.
-    Wide(BytePos),
-    /// Represents a tab character, represented visually with a width of 4 characters.
-    Tab(BytePos),
-}
-
-impl NonNarrowChar {
-    fn new(pos: BytePos, width: usize) -> Self {
-        match width {
-            0 => NonNarrowChar::ZeroWidth(pos),
-            2 => NonNarrowChar::Wide(pos),
-            4 => NonNarrowChar::Tab(pos),
-            _ => panic!("width {} given for non-narrow character", width),
-        }
-    }
-
-    /// Returns the absolute offset of the character in the `SourceMap`.
-    pub fn pos(&self) -> BytePos {
-        match *self {
-            NonNarrowChar::ZeroWidth(p) | NonNarrowChar::Wide(p) | NonNarrowChar::Tab(p) => p,
-        }
-    }
-
-    /// Returns the width of the character, 0 (zero-width) or 2 (wide).
-    pub fn width(&self) -> usize {
-        match *self {
-            NonNarrowChar::ZeroWidth(_) => 0,
-            NonNarrowChar::Wide(_) => 2,
-            NonNarrowChar::Tab(_) => 4,
-        }
-    }
-}
-
-impl Add<BytePos> for NonNarrowChar {
-    type Output = Self;
-
-    fn add(self, rhs: BytePos) -> Self {
-        match self {
-            NonNarrowChar::ZeroWidth(pos) => NonNarrowChar::ZeroWidth(pos + rhs),
-            NonNarrowChar::Wide(pos) => NonNarrowChar::Wide(pos + rhs),
-            NonNarrowChar::Tab(pos) => NonNarrowChar::Tab(pos + rhs),
-        }
-    }
-}
-
-impl Sub<BytePos> for NonNarrowChar {
-    type Output = Self;
-
-    fn sub(self, rhs: BytePos) -> Self {
-        match self {
-            NonNarrowChar::ZeroWidth(pos) => NonNarrowChar::ZeroWidth(pos - rhs),
-            NonNarrowChar::Wide(pos) => NonNarrowChar::Wide(pos - rhs),
-            NonNarrowChar::Tab(pos) => NonNarrowChar::Tab(pos - rhs),
-        }
-    }
-}
-
-/// Identifies an offset of a character that was normalized away from `SourceFile`.
-#[derive(Copy, Clone, RustcEncodable, RustcDecodable, Eq, PartialEq, Debug)]
-pub struct NormalizedPos {
-    /// The absolute offset of the character in the `SourceMap`.
-    pub pos: BytePos,
-    /// The difference between original and normalized string at position.
-    pub diff: u32,
-}
-
-/// The state of the lazy external source loading mechanism of a `SourceFile`.
-#[derive(PartialEq, Eq, Clone)]
-pub enum ExternalSource {
-    /// The external source has been loaded already.
-    Present(String),
-    /// No attempt has been made to load the external source.
-    AbsentOk,
-    /// A failed attempt has been made to load the external source.
-    AbsentErr,
-    /// No external source has to be loaded, since the `SourceFile` represents a local crate.
-    Unneeded,
-}
-
-impl ExternalSource {
-    pub fn is_absent(&self) -> bool {
-        match *self {
-            ExternalSource::Present(_) => false,
-            _ => true,
-        }
-    }
-
-    pub fn get_source(&self) -> Option<&str> {
-        match *self {
-            ExternalSource::Present(ref src) => Some(src),
-            _ => None,
-        }
-    }
-}
-
-#[derive(Debug)]
-pub struct OffsetOverflowError;
-
-/// A single source in the `SourceMap`.
-#[derive(Clone)]
-pub struct SourceFile {
-    /// The name of the file that the source came from. Source that doesn't
-    /// originate from files has names between angle brackets by convention
-    /// (e.g., `<anon>`).
-    pub name: FileName,
-    /// `true` if the `name` field above has been modified by `--remap-path-prefix`.
-    pub name_was_remapped: bool,
-    /// The unmapped path of the file that the source came from.
-    /// Set to `None` if the `SourceFile` was imported from an external crate.
-    pub unmapped_path: Option<FileName>,
-    /// Indicates which crate this `SourceFile` was imported from.
-    pub crate_of_origin: u32,
-    /// The complete source code.
-    pub src: Option<Lrc<String>>,
-    /// The source code's hash.
-    pub src_hash: u128,
-    /// The external source code (used for external crates, which will have a `None`
-    /// value as `self.src`.
-    pub external_src: Lock<ExternalSource>,
-    /// The start position of this source in the `SourceMap`.
-    pub start_pos: BytePos,
-    /// The end position of this source in the `SourceMap`.
-    pub end_pos: BytePos,
-    /// Locations of lines beginnings in the source code.
-    pub lines: Vec<BytePos>,
-    /// Locations of multi-byte characters in the source code.
-    pub multibyte_chars: Vec<MultiByteChar>,
-    /// Width of characters that are not narrow in the source code.
-    pub non_narrow_chars: Vec<NonNarrowChar>,
-    /// Locations of characters removed during normalization.
-    pub normalized_pos: Vec<NormalizedPos>,
-    /// A hash of the filename, used for speeding up hashing in incremental compilation.
-    pub name_hash: u128,
-}
-
-impl Encodable for SourceFile {
-    fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
-        s.emit_struct("SourceFile", 8, |s| {
-            s.emit_struct_field("name", 0, |s| self.name.encode(s))?;
-            s.emit_struct_field("name_was_remapped", 1, |s| self.name_was_remapped.encode(s))?;
-            s.emit_struct_field("src_hash", 2, |s| self.src_hash.encode(s))?;
-            s.emit_struct_field("start_pos", 3, |s| self.start_pos.encode(s))?;
-            s.emit_struct_field("end_pos", 4, |s| self.end_pos.encode(s))?;
-            s.emit_struct_field("lines", 5, |s| {
-                let lines = &self.lines[..];
-                // Store the length.
-                s.emit_u32(lines.len() as u32)?;
-
-                if !lines.is_empty() {
-                    // In order to preserve some space, we exploit the fact that
-                    // the lines list is sorted and individual lines are
-                    // probably not that long. Because of that we can store lines
-                    // as a difference list, using as little space as possible
-                    // for the differences.
-                    let max_line_length = if lines.len() == 1 {
-                        0
-                    } else {
-                        lines.windows(2).map(|w| w[1] - w[0]).map(|bp| bp.to_usize()).max().unwrap()
-                    };
-
-                    let bytes_per_diff: u8 = match max_line_length {
-                        0..=0xFF => 1,
-                        0x100..=0xFFFF => 2,
-                        _ => 4,
-                    };
-
-                    // Encode the number of bytes used per diff.
-                    bytes_per_diff.encode(s)?;
-
-                    // Encode the first element.
-                    lines[0].encode(s)?;
-
-                    let diff_iter = (&lines[..]).windows(2).map(|w| (w[1] - w[0]));
-
-                    match bytes_per_diff {
-                        1 => {
-                            for diff in diff_iter {
-                                (diff.0 as u8).encode(s)?
-                            }
-                        }
-                        2 => {
-                            for diff in diff_iter {
-                                (diff.0 as u16).encode(s)?
-                            }
-                        }
-                        4 => {
-                            for diff in diff_iter {
-                                diff.0.encode(s)?
-                            }
-                        }
-                        _ => unreachable!(),
-                    }
-                }
-
-                Ok(())
-            })?;
-            s.emit_struct_field("multibyte_chars", 6, |s| self.multibyte_chars.encode(s))?;
-            s.emit_struct_field("non_narrow_chars", 7, |s| self.non_narrow_chars.encode(s))?;
-            s.emit_struct_field("name_hash", 8, |s| self.name_hash.encode(s))?;
-            s.emit_struct_field("normalized_pos", 9, |s| self.normalized_pos.encode(s))
-        })
-    }
-}
-
-impl Decodable for SourceFile {
-    fn decode<D: Decoder>(d: &mut D) -> Result<SourceFile, D::Error> {
-        d.read_struct("SourceFile", 8, |d| {
-            let name: FileName = d.read_struct_field("name", 0, |d| Decodable::decode(d))?;
-            let name_was_remapped: bool =
-                d.read_struct_field("name_was_remapped", 1, |d| Decodable::decode(d))?;
-            let src_hash: u128 = d.read_struct_field("src_hash", 2, |d| Decodable::decode(d))?;
-            let start_pos: BytePos =
-                d.read_struct_field("start_pos", 3, |d| Decodable::decode(d))?;
-            let end_pos: BytePos = d.read_struct_field("end_pos", 4, |d| Decodable::decode(d))?;
-            let lines: Vec<BytePos> = d.read_struct_field("lines", 5, |d| {
-                let num_lines: u32 = Decodable::decode(d)?;
-                let mut lines = Vec::with_capacity(num_lines as usize);
-
-                if num_lines > 0 {
-                    // Read the number of bytes used per diff.
-                    let bytes_per_diff: u8 = Decodable::decode(d)?;
-
-                    // Read the first element.
-                    let mut line_start: BytePos = Decodable::decode(d)?;
-                    lines.push(line_start);
-
-                    for _ in 1..num_lines {
-                        let diff = match bytes_per_diff {
-                            1 => d.read_u8()? as u32,
-                            2 => d.read_u16()? as u32,
-                            4 => d.read_u32()?,
-                            _ => unreachable!(),
-                        };
-
-                        line_start = line_start + BytePos(diff);
-
-                        lines.push(line_start);
-                    }
-                }
-
-                Ok(lines)
-            })?;
-            let multibyte_chars: Vec<MultiByteChar> =
-                d.read_struct_field("multibyte_chars", 6, |d| Decodable::decode(d))?;
-            let non_narrow_chars: Vec<NonNarrowChar> =
-                d.read_struct_field("non_narrow_chars", 7, |d| Decodable::decode(d))?;
-            let name_hash: u128 = d.read_struct_field("name_hash", 8, |d| Decodable::decode(d))?;
-            let normalized_pos: Vec<NormalizedPos> =
-                d.read_struct_field("normalized_pos", 9, |d| Decodable::decode(d))?;
-            Ok(SourceFile {
-                name,
-                name_was_remapped,
-                unmapped_path: None,
-                // `crate_of_origin` has to be set by the importer.
-                // This value matches up with `rustc::hir::def_id::INVALID_CRATE`.
-                // That constant is not available here, unfortunately.
-                crate_of_origin: std::u32::MAX - 1,
-                start_pos,
-                end_pos,
-                src: None,
-                src_hash,
-                external_src: Lock::new(ExternalSource::AbsentOk),
-                lines,
-                multibyte_chars,
-                non_narrow_chars,
-                normalized_pos,
-                name_hash,
-            })
-        })
-    }
-}
-
-impl fmt::Debug for SourceFile {
-    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(fmt, "SourceFile({})", self.name)
-    }
-}
-
-impl SourceFile {
-    pub fn new(
-        name: FileName,
-        name_was_remapped: bool,
-        unmapped_path: FileName,
-        mut src: String,
-        start_pos: BytePos,
-    ) -> Result<SourceFile, OffsetOverflowError> {
-        let normalized_pos = normalize_src(&mut src, start_pos);
-
-        let src_hash = {
-            let mut hasher: StableHasher = StableHasher::new();
-            hasher.write(src.as_bytes());
-            hasher.finish::<u128>()
-        };
-        let name_hash = {
-            let mut hasher: StableHasher = StableHasher::new();
-            name.hash(&mut hasher);
-            hasher.finish::<u128>()
-        };
-        let end_pos = start_pos.to_usize() + src.len();
-        if end_pos > u32::max_value() as usize {
-            return Err(OffsetOverflowError);
-        }
-
-        let (lines, multibyte_chars, non_narrow_chars) =
-            analyze_source_file::analyze_source_file(&src[..], start_pos);
-
-        Ok(SourceFile {
-            name,
-            name_was_remapped,
-            unmapped_path: Some(unmapped_path),
-            crate_of_origin: 0,
-            src: Some(Lrc::new(src)),
-            src_hash,
-            external_src: Lock::new(ExternalSource::Unneeded),
-            start_pos,
-            end_pos: Pos::from_usize(end_pos),
-            lines,
-            multibyte_chars,
-            non_narrow_chars,
-            normalized_pos,
-            name_hash,
-        })
-    }
-
-    /// Returns the `BytePos` of the beginning of the current line.
-    pub fn line_begin_pos(&self, pos: BytePos) -> BytePos {
-        let line_index = self.lookup_line(pos).unwrap();
-        self.lines[line_index]
-    }
-
-    /// Add externally loaded source.
-    /// If the hash of the input doesn't match or no input is supplied via None,
-    /// it is interpreted as an error and the corresponding enum variant is set.
-    /// The return value signifies whether some kind of source is present.
-    pub fn add_external_src<F>(&self, get_src: F) -> bool
-    where
-        F: FnOnce() -> Option<String>,
-    {
-        if *self.external_src.borrow() == ExternalSource::AbsentOk {
-            let src = get_src();
-            let mut external_src = self.external_src.borrow_mut();
-            // Check that no-one else have provided the source while we were getting it
-            if *external_src == ExternalSource::AbsentOk {
-                if let Some(src) = src {
-                    let mut hasher: StableHasher = StableHasher::new();
-                    hasher.write(src.as_bytes());
-
-                    if hasher.finish::<u128>() == self.src_hash {
-                        *external_src = ExternalSource::Present(src);
-                        return true;
-                    }
-                } else {
-                    *external_src = ExternalSource::AbsentErr;
-                }
-
-                false
-            } else {
-                self.src.is_some() || external_src.get_source().is_some()
-            }
-        } else {
-            self.src.is_some() || self.external_src.borrow().get_source().is_some()
-        }
-    }
-
-    /// Gets a line from the list of pre-computed line-beginnings.
-    /// The line number here is 0-based.
-    pub fn get_line(&self, line_number: usize) -> Option<Cow<'_, str>> {
-        fn get_until_newline(src: &str, begin: usize) -> &str {
-            // We can't use `lines.get(line_number+1)` because we might
-            // be parsing when we call this function and thus the current
-            // line is the last one we have line info for.
-            let slice = &src[begin..];
-            match slice.find('\n') {
-                Some(e) => &slice[..e],
-                None => slice,
-            }
-        }
-
-        let begin = {
-            let line = if let Some(line) = self.lines.get(line_number) {
-                line
-            } else {
-                return None;
-            };
-            let begin: BytePos = *line - self.start_pos;
-            begin.to_usize()
-        };
-
-        if let Some(ref src) = self.src {
-            Some(Cow::from(get_until_newline(src, begin)))
-        } else if let Some(src) = self.external_src.borrow().get_source() {
-            Some(Cow::Owned(String::from(get_until_newline(src, begin))))
-        } else {
-            None
-        }
-    }
-
-    pub fn is_real_file(&self) -> bool {
-        self.name.is_real()
-    }
-
-    pub fn is_imported(&self) -> bool {
-        self.src.is_none()
-    }
-
-    pub fn byte_length(&self) -> u32 {
-        self.end_pos.0 - self.start_pos.0
-    }
-    pub fn count_lines(&self) -> usize {
-        self.lines.len()
-    }
-
-    /// Finds the line containing the given position. The return value is the
-    /// index into the `lines` array of this `SourceFile`, not the 1-based line
-    /// number. If the source_file is empty or the position is located before the
-    /// first line, `None` is returned.
-    pub fn lookup_line(&self, pos: BytePos) -> Option<usize> {
-        if self.lines.len() == 0 {
-            return None;
-        }
-
-        let line_index = lookup_line(&self.lines[..], pos);
-        assert!(line_index < self.lines.len() as isize);
-        if line_index >= 0 { Some(line_index as usize) } else { None }
-    }
-
-    pub fn line_bounds(&self, line_index: usize) -> (BytePos, BytePos) {
-        if self.start_pos == self.end_pos {
-            return (self.start_pos, self.end_pos);
-        }
-
-        assert!(line_index < self.lines.len());
-        if line_index == (self.lines.len() - 1) {
-            (self.lines[line_index], self.end_pos)
-        } else {
-            (self.lines[line_index], self.lines[line_index + 1])
-        }
-    }
-
-    #[inline]
-    pub fn contains(&self, byte_pos: BytePos) -> bool {
-        byte_pos >= self.start_pos && byte_pos <= self.end_pos
-    }
-
-    /// Calculates the original byte position relative to the start of the file
-    /// based on the given byte position.
-    pub fn original_relative_byte_pos(&self, pos: BytePos) -> BytePos {
-        // Diff before any records is 0. Otherwise use the previously recorded
-        // diff as that applies to the following characters until a new diff
-        // is recorded.
-        let diff = match self.normalized_pos.binary_search_by(|np| np.pos.cmp(&pos)) {
-            Ok(i) => self.normalized_pos[i].diff,
-            Err(i) if i == 0 => 0,
-            Err(i) => self.normalized_pos[i - 1].diff,
-        };
-
-        BytePos::from_u32(pos.0 - self.start_pos.0 + diff)
-    }
-}
-
-/// Normalizes the source code and records the normalizations.
-fn normalize_src(src: &mut String, start_pos: BytePos) -> Vec<NormalizedPos> {
-    let mut normalized_pos = vec![];
-    remove_bom(src, &mut normalized_pos);
-    normalize_newlines(src, &mut normalized_pos);
-
-    // Offset all the positions by start_pos to match the final file positions.
-    for np in &mut normalized_pos {
-        np.pos.0 += start_pos.0;
-    }
-
-    normalized_pos
-}
-
-/// Removes UTF-8 BOM, if any.
-fn remove_bom(src: &mut String, normalized_pos: &mut Vec<NormalizedPos>) {
-    if src.starts_with("\u{feff}") {
-        src.drain(..3);
-        normalized_pos.push(NormalizedPos { pos: BytePos(0), diff: 3 });
-    }
-}
-
-/// Replaces `\r\n` with `\n` in-place in `src`.
-///
-/// Returns error if there's a lone `\r` in the string
-fn normalize_newlines(src: &mut String, normalized_pos: &mut Vec<NormalizedPos>) {
-    if !src.as_bytes().contains(&b'\r') {
-        return;
-    }
-
-    // We replace `\r\n` with `\n` in-place, which doesn't break utf-8 encoding.
-    // While we *can* call `as_mut_vec` and do surgery on the live string
-    // directly, let's rather steal the contents of `src`. This makes the code
-    // safe even if a panic occurs.
-
-    let mut buf = std::mem::replace(src, String::new()).into_bytes();
-    let mut gap_len = 0;
-    let mut tail = buf.as_mut_slice();
-    let mut cursor = 0;
-    let original_gap = normalized_pos.last().map_or(0, |l| l.diff);
-    loop {
-        let idx = match find_crlf(&tail[gap_len..]) {
-            None => tail.len(),
-            Some(idx) => idx + gap_len,
-        };
-        tail.copy_within(gap_len..idx, 0);
-        tail = &mut tail[idx - gap_len..];
-        if tail.len() == gap_len {
-            break;
-        }
-        cursor += idx - gap_len;
-        gap_len += 1;
-        normalized_pos.push(NormalizedPos {
-            pos: BytePos::from_usize(cursor + 1),
-            diff: original_gap + gap_len as u32,
-        });
-    }
-
-    // Account for removed `\r`.
-    // After `set_len`, `buf` is guaranteed to contain utf-8 again.
-    let new_len = buf.len() - gap_len;
-    unsafe {
-        buf.set_len(new_len);
-        *src = String::from_utf8_unchecked(buf);
-    }
-
-    fn find_crlf(src: &[u8]) -> Option<usize> {
-        let mut search_idx = 0;
-        while let Some(idx) = find_cr(&src[search_idx..]) {
-            if src[search_idx..].get(idx + 1) != Some(&b'\n') {
-                search_idx += idx + 1;
-                continue;
-            }
-            return Some(search_idx + idx);
-        }
-        None
-    }
-
-    fn find_cr(src: &[u8]) -> Option<usize> {
-        src.iter().position(|&b| b == b'\r')
-    }
-}
-
-// _____________________________________________________________________________
-// Pos, BytePos, CharPos
-//
-
-pub trait Pos {
-    fn from_usize(n: usize) -> Self;
-    fn to_usize(&self) -> usize;
-    fn from_u32(n: u32) -> Self;
-    fn to_u32(&self) -> u32;
-}
-
-/// A byte offset. Keep this small (currently 32-bits), as AST contains
-/// a lot of them.
-#[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord, Debug)]
-pub struct BytePos(pub u32);
-
-/// A character offset. Because of multibyte UTF-8 characters, a byte offset
-/// is not equivalent to a character offset. The `SourceMap` will convert `BytePos`
-/// values to `CharPos` values as necessary.
-#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug)]
-pub struct CharPos(pub usize);
-
-// FIXME: lots of boilerplate in these impls, but so far my attempts to fix
-// have been unsuccessful.
-
-impl Pos for BytePos {
-    #[inline(always)]
-    fn from_usize(n: usize) -> BytePos {
-        BytePos(n as u32)
-    }
-
-    #[inline(always)]
-    fn to_usize(&self) -> usize {
-        self.0 as usize
-    }
-
-    #[inline(always)]
-    fn from_u32(n: u32) -> BytePos {
-        BytePos(n)
-    }
-
-    #[inline(always)]
-    fn to_u32(&self) -> u32 {
-        self.0
-    }
-}
-
-impl Add for BytePos {
-    type Output = BytePos;
-
-    #[inline(always)]
-    fn add(self, rhs: BytePos) -> BytePos {
-        BytePos((self.to_usize() + rhs.to_usize()) as u32)
-    }
-}
-
-impl Sub for BytePos {
-    type Output = BytePos;
-
-    #[inline(always)]
-    fn sub(self, rhs: BytePos) -> BytePos {
-        BytePos((self.to_usize() - rhs.to_usize()) as u32)
-    }
-}
-
-impl Encodable for BytePos {
-    fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
-        s.emit_u32(self.0)
-    }
-}
-
-impl Decodable for BytePos {
-    fn decode<D: Decoder>(d: &mut D) -> Result<BytePos, D::Error> {
-        Ok(BytePos(d.read_u32()?))
-    }
-}
-
-impl Pos for CharPos {
-    #[inline(always)]
-    fn from_usize(n: usize) -> CharPos {
-        CharPos(n)
-    }
-
-    #[inline(always)]
-    fn to_usize(&self) -> usize {
-        self.0
-    }
-
-    #[inline(always)]
-    fn from_u32(n: u32) -> CharPos {
-        CharPos(n as usize)
-    }
-
-    #[inline(always)]
-    fn to_u32(&self) -> u32 {
-        self.0 as u32
-    }
-}
-
-impl Add for CharPos {
-    type Output = CharPos;
-
-    #[inline(always)]
-    fn add(self, rhs: CharPos) -> CharPos {
-        CharPos(self.to_usize() + rhs.to_usize())
-    }
-}
-
-impl Sub for CharPos {
-    type Output = CharPos;
-
-    #[inline(always)]
-    fn sub(self, rhs: CharPos) -> CharPos {
-        CharPos(self.to_usize() - rhs.to_usize())
-    }
-}
-
-// _____________________________________________________________________________
-// Loc, SourceFileAndLine, SourceFileAndBytePos
-//
-
-/// A source code location used for error reporting.
-#[derive(Debug, Clone)]
-pub struct Loc {
-    /// Information about the original source.
-    pub file: Lrc<SourceFile>,
-    /// The (1-based) line number.
-    pub line: usize,
-    /// The (0-based) column offset.
-    pub col: CharPos,
-    /// The (0-based) column offset when displayed.
-    pub col_display: usize,
-}
-
-// Used to be structural records.
-#[derive(Debug)]
-pub struct SourceFileAndLine {
-    pub sf: Lrc<SourceFile>,
-    pub line: usize,
-}
-#[derive(Debug)]
-pub struct SourceFileAndBytePos {
-    pub sf: Lrc<SourceFile>,
-    pub pos: BytePos,
-}
-
-#[derive(Copy, Clone, Debug, PartialEq, Eq)]
-pub struct LineInfo {
-    /// Index of line, starting from 0.
-    pub line_index: usize,
-
-    /// Column in line where span begins, starting from 0.
-    pub start_col: CharPos,
-
-    /// Column in line where span ends, starting from 0, exclusive.
-    pub end_col: CharPos,
-}
-
-pub struct FileLines {
-    pub file: Lrc<SourceFile>,
-    pub lines: Vec<LineInfo>,
-}
-
-pub static SPAN_DEBUG: AtomicRef<fn(Span, &mut fmt::Formatter<'_>) -> fmt::Result> =
-    AtomicRef::new(&(default_span_debug as fn(_, &mut fmt::Formatter<'_>) -> _));
-
-#[derive(Debug)]
-pub struct MacroBacktrace {
-    /// span where macro was applied to generate this code
-    pub call_site: Span,
-
-    /// name of macro that was applied (e.g., "foo!" or "#[derive(Eq)]")
-    pub macro_decl_name: String,
-
-    /// span where macro was defined (possibly dummy)
-    pub def_site_span: Span,
-}
-
-// _____________________________________________________________________________
-// SpanLinesError, SpanSnippetError, DistinctSources, MalformedSourceMapPositions
-//
-
-pub type FileLinesResult = Result<FileLines, SpanLinesError>;
-
-#[derive(Clone, PartialEq, Eq, Debug)]
-pub enum SpanLinesError {
-    DistinctSources(DistinctSources),
-}
-
-#[derive(Clone, PartialEq, Eq, Debug)]
-pub enum SpanSnippetError {
-    IllFormedSpan(Span),
-    DistinctSources(DistinctSources),
-    MalformedForSourcemap(MalformedSourceMapPositions),
-    SourceNotAvailable { filename: FileName },
-}
-
-#[derive(Clone, PartialEq, Eq, Debug)]
-pub struct DistinctSources {
-    pub begin: (FileName, BytePos),
-    pub end: (FileName, BytePos),
-}
-
-#[derive(Clone, PartialEq, Eq, Debug)]
-pub struct MalformedSourceMapPositions {
-    pub name: FileName,
-    pub source_len: usize,
-    pub begin_pos: BytePos,
-    pub end_pos: BytePos,
-}
-
-/// Range inside of a `Span` used for diagnostics when we only have access to relative positions.
-#[derive(Copy, Clone, PartialEq, Eq, Debug)]
-pub struct InnerSpan {
-    pub start: usize,
-    pub end: usize,
-}
-
-impl InnerSpan {
-    pub fn new(start: usize, end: usize) -> InnerSpan {
-        InnerSpan { start, end }
-    }
-}
-
-// Given a slice of line start positions and a position, returns the index of
-// the line the position is on. Returns -1 if the position is located before
-// the first line.
-fn lookup_line(lines: &[BytePos], pos: BytePos) -> isize {
-    match lines.binary_search(&pos) {
-        Ok(line) => line as isize,
-        Err(line) => line as isize - 1,
-    }
-}
-
-/// Requirements for a `StableHashingContext` to be used in this crate.
-/// This is a hack to allow using the `HashStable_Generic` derive macro
-/// instead of implementing everything in librustc.
-pub trait HashStableContext {
-    fn hash_spans(&self) -> bool;
-    fn byte_pos_to_line_and_col(
-        &mut self,
-        byte: BytePos,
-    ) -> Option<(Lrc<SourceFile>, usize, BytePos)>;
-}
-
-impl<CTX> HashStable<CTX> for Span
-where
-    CTX: HashStableContext,
-{
-    /// Hashes a span in a stable way. We can't directly hash the span's `BytePos`
-    /// fields (that would be similar to hashing pointers, since those are just
-    /// offsets into the `SourceMap`). Instead, we hash the (file name, line, column)
-    /// triple, which stays the same even if the containing `SourceFile` has moved
-    /// within the `SourceMap`.
-    /// Also note that we are hashing byte offsets for the column, not unicode
-    /// codepoint offsets. For the purpose of the hash that's sufficient.
-    /// Also, hashing filenames is expensive so we avoid doing it twice when the
-    /// span starts and ends in the same file, which is almost always the case.
-    fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher) {
-        const TAG_VALID_SPAN: u8 = 0;
-        const TAG_INVALID_SPAN: u8 = 1;
-        const TAG_EXPANSION: u8 = 0;
-        const TAG_NO_EXPANSION: u8 = 1;
-
-        if !ctx.hash_spans() {
-            return;
-        }
-
-        if *self == DUMMY_SP {
-            return std::hash::Hash::hash(&TAG_INVALID_SPAN, hasher);
-        }
-
-        // If this is not an empty or invalid span, we want to hash the last
-        // position that belongs to it, as opposed to hashing the first
-        // position past it.
-        let span = self.data();
-        let (file_lo, line_lo, col_lo) = match ctx.byte_pos_to_line_and_col(span.lo) {
-            Some(pos) => pos,
-            None => {
-                return std::hash::Hash::hash(&TAG_INVALID_SPAN, hasher);
-            }
-        };
-
-        if !file_lo.contains(span.hi) {
-            return std::hash::Hash::hash(&TAG_INVALID_SPAN, hasher);
-        }
-
-        std::hash::Hash::hash(&TAG_VALID_SPAN, hasher);
-        // We truncate the stable ID hash and line and column numbers. The chances
-        // of causing a collision this way should be minimal.
-        std::hash::Hash::hash(&(file_lo.name_hash as u64), hasher);
-
-        let col = (col_lo.0 as u64) & 0xFF;
-        let line = ((line_lo as u64) & 0xFF_FF_FF) << 8;
-        let len = ((span.hi - span.lo).0 as u64) << 32;
-        let line_col_len = col | line | len;
-        std::hash::Hash::hash(&line_col_len, hasher);
-
-        if span.ctxt == SyntaxContext::root() {
-            TAG_NO_EXPANSION.hash_stable(ctx, hasher);
-        } else {
-            TAG_EXPANSION.hash_stable(ctx, hasher);
-
-            // Since the same expansion context is usually referenced many
-            // times, we cache a stable hash of it and hash that instead of
-            // recursing every time.
-            thread_local! {
-                static CACHE: RefCell<FxHashMap<hygiene::ExpnId, u64>> = Default::default();
-            }
-
-            let sub_hash: u64 = CACHE.with(|cache| {
-                let expn_id = span.ctxt.outer_expn();
-
-                if let Some(&sub_hash) = cache.borrow().get(&expn_id) {
-                    return sub_hash;
-                }
-
-                let mut hasher = StableHasher::new();
-                expn_id.expn_data().hash_stable(ctx, &mut hasher);
-                let sub_hash: Fingerprint = hasher.finish();
-                let sub_hash = sub_hash.to_smaller_hash();
-                cache.borrow_mut().insert(expn_id, sub_hash);
-                sub_hash
-            });
-
-            sub_hash.hash_stable(ctx, hasher);
-        }
-    }
-}