Auto merge of #66141 - Centril:rollup-n2fcvp9, r=Centril

Rollup of 11 pull requests

Successful merges:

 - #65892 (Remove `PartialEq` and `Eq` from the `SpecialDerives`.)
 - #66014 (Show type parameter name and definition in type mismatch error messages )
 - #66027 (Move has_panic_handler to query)
 - #66054 (syntax: Avoid span arithmetic for delimiter tokens)
 - #66068 (use silent emitter for rustdoc highlighting pass)
 - #66081 (let caller of check_ptr_access_align control the error message)
 - #66093 (Do not ICE with a precision flag in formatting str and no format arguments)
 - #66098 (Detect `::` -> `:` typo when involving turbofish)
 - #66101 (Tweak type mismatch caused by break on tail expr)
 - #66106 (Fix typo in explanation of `E0080`)
 - #66115 (rustc: remove "GlobalMetaData" dead code from hir::map::definitions.)

Failed merges:

r? @ghost

1 files changed, 2 insertions, 12 deletions

diff --git a/src/librustc_interface/interface.rs b/src/librustc_interface/interface.rs
index e014e4ed0fd..4e4d6d982fb 100644
--- a/src/librustc_interface/interface.rs
+++ b/src/librustc_interface/interface.rs
@@ -17,10 +17,9 @@ use std::sync::{Arc, Mutex};
 use syntax::{self, parse};
 use syntax::ast::{self, MetaItemKind};
 use syntax::parse::token;
-use syntax::source_map::{FileName, FilePathMapping, FileLoader, SourceMap};
+use syntax::source_map::{FileName, FileLoader, SourceMap};
 use syntax::sess::ParseSess;
 use syntax_pos::edition;
-use rustc_errors::{Diagnostic, emitter::Emitter, Handler, SourceMapperDyn};
 
 pub type Result<T> = result::Result<T, ErrorReported>;
 
@@ -63,18 +62,9 @@ impl Compiler {
 
 /// Converts strings provided as `--cfg [cfgspec]` into a `crate_cfg`.
 pub fn parse_cfgspecs(cfgspecs: Vec<String>) -> FxHashSet<(String, Option<String>)> {
-    struct NullEmitter;
-    impl Emitter for NullEmitter {
-        fn emit_diagnostic(&mut self, _: &Diagnostic) {}
-        fn source_map(&self) -> Option<&Lrc<SourceMapperDyn>> { None }
-    }
-
     syntax::with_default_globals(move || {
         let cfg = cfgspecs.into_iter().map(|s| {
-
-            let cm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
-            let handler = Handler::with_emitter(false, None, Box::new(NullEmitter));
-            let sess = ParseSess::with_span_handler(handler, cm);
+            let sess = ParseSess::with_silent_emitter();
             let filename = FileName::cfg_spec_source_code(&s);
             let mut parser = parse::new_parser_from_source_str(&sess, filename, s.to_string());