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Auto merge of #77524 - Patryk27:fixes/66228, r=estebank

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Rework diagnostics for wrong number of generic args (fixes #66228 and #71924)

This PR reworks the `wrong number of {} arguments` message, so that it provides more details and contextual hints.
This commit is contained in:
bors 2021-01-13 20:35:58 +00:00
commit a62a76047e
121 changed files with 2787 additions and 766 deletions
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6
compiler/rustc_ast_lowering/src/path.rs
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@ -401,15 +401,15 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
// compatibility, even in contexts like an impl header where
// we generally don't permit such things (see #51008).
self.with_anonymous_lifetime_mode(AnonymousLifetimeMode::PassThrough, |this| {
let &ParenthesizedArgs { ref inputs, ref output, span } = data;
let ParenthesizedArgs { span, inputs, inputs_span, output } = data;
let inputs = this.arena.alloc_from_iter(
inputs.iter().map(|ty| this.lower_ty_direct(ty, ImplTraitContext::disallowed())),
);
let output_ty = match output {
FnRetTy::Ty(ty) => this.lower_ty(&ty, ImplTraitContext::disallowed()),
FnRetTy::Default(_) => this.arena.alloc(this.ty_tup(span, &[])),
FnRetTy::Default(_) => this.arena.alloc(this.ty_tup(*span, &[])),
};
let args = smallvec![GenericArg::Type(this.ty_tup(span, inputs))];
let args = smallvec![GenericArg::Type(this.ty_tup(*inputs_span, inputs))];
let binding = this.output_ty_binding(output_ty.span, output_ty);
(
GenericArgsCtor { args, bindings: arena_vec![this; binding], parenthesized: true },