diff options
Diffstat (limited to 'src/libsyntax/std_inject.rs')
| -rw-r--r-- | src/libsyntax/std_inject.rs | 22 |
1 files changed, 7 insertions, 15 deletions
diff --git a/src/libsyntax/std_inject.rs b/src/libsyntax/std_inject.rs index 81f9ff9b661..d86b76f71ec 100644 --- a/src/libsyntax/std_inject.rs +++ b/src/libsyntax/std_inject.rs @@ -1,7 +1,7 @@ use crate::ast; use crate::attr; use crate::edition::Edition; -use crate::ext::hygiene::{Mark, SyntaxContext, MacroKind}; +use crate::ext::hygiene::{Mark, MacroKind}; use crate::symbol::{Ident, Symbol, kw, sym}; use crate::source_map::{ExpnInfo, ExpnKind, dummy_spanned, respan}; use crate::ptr::P; @@ -9,19 +9,7 @@ use crate::tokenstream::TokenStream; use std::cell::Cell; use std::iter; -use syntax_pos::{DUMMY_SP, Span}; - -/// Craft a span that will be ignored by the stability lint's -/// call to source_map's `is_internal` check. -/// The expanded code uses the unstable `#[prelude_import]` attribute. -fn ignored_span(sp: Span, edition: Edition) -> Span { - let mark = Mark::fresh(Mark::root()); - mark.set_expn_info(ExpnInfo::with_unstable( - ExpnKind::Macro(MacroKind::Attr, Symbol::intern("std_inject")), sp, edition, - &[sym::prelude_import], - )); - sp.with_ctxt(SyntaxContext::empty().apply_mark(mark)) -} +use syntax_pos::DUMMY_SP; pub fn injected_crate_name() -> Option<&'static str> { INJECTED_CRATE_NAME.with(|name| name.get()) @@ -87,7 +75,11 @@ pub fn maybe_inject_crates_ref( INJECTED_CRATE_NAME.with(|opt_name| opt_name.set(Some(name))); - let span = ignored_span(DUMMY_SP, edition); + let span = DUMMY_SP.fresh_expansion(Mark::root(), ExpnInfo::allow_unstable( + ExpnKind::Macro(MacroKind::Attr, sym::std_inject), DUMMY_SP, edition, + [sym::prelude_import][..].into(), + )); + krate.module.items.insert(0, P(ast::Item { attrs: vec![ast::Attribute { style: ast::AttrStyle::Outer, |