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Rollup merge of #83092 - petrochenkov:qspan, r=estebank

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More precise spans for HIR paths

`Ty::assoc_item` is lowered to `<Ty>::assoc_item` in HIR, but `Ty` got span from the whole path.
This PR fixes that, and adjusts some diagnostic code that relied on `Ty` having the whole path span.

This is a pre-requisite for https://github.com/rust-lang/rust/pull/82868 (we cannot report suggestions like `Tr::assoc` -> `<dyn Tr>::assoc` with the current imprecise spans).
r? ````@estebank````
This commit is contained in:
Yuki Okushi 2021-03-17 15:20:54 +09:00 • committed by GitHub
commit 70edab895d
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27 changed files with 86 additions and 66 deletions
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9
compiler/rustc_typeck/src/astconv/mod.rs
View file

@ -1414,8 +1414,13 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
name: Symbol,
) {
let mut err = struct_span_err!(self.tcx().sess, span, E0223, "ambiguous associated type");
if let (Some(_), Ok(snippet)) = (
self.tcx().sess.confused_type_with_std_module.borrow().get(&span),
if let (true, Ok(snippet)) = (
self.tcx()
.sess
.confused_type_with_std_module
.borrow()
.keys()
.any(|full_span| full_span.contains(span)),
self.tcx().sess.source_map().span_to_snippet(span),
) {
err.span_suggestion(

2
compiler/rustc_typeck/src/check/fn_ctxt/checks.rs
View file

@ -439,7 +439,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
qpath: &QPath<'_>,
hir_id: hir::HirId,
) -> Option<(&'tcx ty::VariantDef, Ty<'tcx>)> {
let path_span = qpath.qself_span();
let path_span = qpath.span();
let (def, ty) = self.finish_resolving_struct_path(qpath, path_span, hir_id);
let variant = match def {
Res::Err => {