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Add an optional Span to BrAnon and use it to print better error for HRTB error from generator interior

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This commit is contained in:
Jack Huey
2022-10-17 22:08:15 -04:00
parent 1e1e5b8d98
commit 00e314d5ed
23 changed files with 251 additions and 63 deletions
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4
compiler/rustc_hir_analysis/src/astconv/mod.rs
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@@ -2976,7 +2976,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
) {
for br in referenced_regions.difference(&constrained_regions) {
let br_name = match *br {
ty::BrNamed(_, kw::UnderscoreLifetime) | ty::BrAnon(_) | ty::BrEnv => {
ty::BrNamed(_, kw::UnderscoreLifetime) | ty::BrAnon(..) | ty::BrEnv => {
"an anonymous lifetime".to_string()
}
ty::BrNamed(_, name) => format!("lifetime `{}`", name),
@@ -2984,7 +2984,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
let mut err = generate_err(&br_name);
if let ty::BrNamed(_, kw::UnderscoreLifetime) | ty::BrAnon(_) = *br {
if let ty::BrNamed(_, kw::UnderscoreLifetime) | ty::BrAnon(..) = *br {
// The only way for an anonymous lifetime to wind up
// in the return type but **also** be unconstrained is
// if it only appears in "associated types" in the