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Use correct span for structured suggestion

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On structured suggestion for `let` -> `const`  and `const` -> `let`, use
a proper `Span` and update tests to check the correct application.

Follow up to #80012.
This commit is contained in:
Esteban Küber 2021-01-07 16:44:08 -08:00
parent c8915eebea
commit 9a5dcaab67
27 changed files with 146 additions and 64 deletions
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26
compiler/rustc_resolve/src/diagnostics.rs
View file

@ -398,20 +398,30 @@ impl<'a> Resolver<'a> {
err.help("use the `|| { ... }` closure form instead");
err
}
ResolutionError::AttemptToUseNonConstantValueInConstant(ident, sugg) => {
ResolutionError::AttemptToUseNonConstantValueInConstant(ident, sugg, current) => {
let mut err = struct_span_err!(
self.session,
span,
E0435,
"attempt to use a non-constant value in a constant"
);
err.span_suggestion(
ident.span,
&sugg,
"".to_string(),
Applicability::MaybeIncorrect,
);
err.span_label(span, "non-constant value");
// let foo =...
// ^^^ given this Span
// ------- get this Span to have an applicable suggestion
let sp =
self.session.source_map().span_extend_to_prev_str(ident.span, current, true);
if sp.lo().0 == 0 {
err.span_label(ident.span, &format!("this would need to be a `{}`", sugg));
} else {
let sp = sp.with_lo(BytePos(sp.lo().0 - current.len() as u32));
err.span_suggestion(
sp,
&format!("consider using `{}` instead of `{}`", sugg, current),
format!("{} {}", sugg, ident),
Applicability::MaybeIncorrect,
);
err.span_label(span, "non-constant value");
}
err
}
ResolutionError::BindingShadowsSomethingUnacceptable(what_binding, name, binding) => {