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Clean up OnUnimplementedFormatString::verify #106748

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merged 1 commit into from
Jan 12, 2023
Merged

Clean up OnUnimplementedFormatString::verify #106748

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61 changes: 32 additions & 29 deletions compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,21 @@ pub trait TypeErrCtxtExt<'tcx> {
) -> OnUnimplementedNote;
}

/// The symbols which are always allowed in a format string
static ALLOWED_FORMAT_SYMBOLS: &[Symbol] = &[
kw::SelfUpper,
sym::ItemContext,
sym::from_method,
sym::from_desugaring,
sym::direct,
sym::cause,
sym::integral,
sym::integer_,
sym::float,
sym::_Self,
sym::crate_local,
];

impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
fn impl_similar_to(
&self,
Expand Down Expand Up @@ -543,38 +558,26 @@ impl<'tcx> OnUnimplementedFormatString {
Piece::NextArgument(a) => match a.position {
Position::ArgumentNamed(s) => {
match Symbol::intern(s) {
// `{Self}` is allowed
kw::SelfUpper => (),
// `{ThisTraitsName}` is allowed
s if s == trait_name => (),
// `{from_method}` is allowed
sym::from_method => (),
// `{from_desugaring}` is allowed
sym::from_desugaring => (),
// `{ItemContext}` is allowed
sym::ItemContext => (),
// `{integral}` and `{integer}` and `{float}` are allowed
sym::integral | sym::integer_ | sym::float => (),
s if ALLOWED_FORMAT_SYMBOLS.contains(&s) => (),
// So is `{A}` if A is a type parameter
s => match generics.params.iter().find(|param| param.name == s) {
Some(_) => (),
None => {
let reported = struct_span_err!(
tcx.sess,
span,
E0230,
"there is no parameter `{}` on {}",
s,
if trait_def_id == item_def_id {
format!("trait `{}`", trait_name)
} else {
"impl".to_string()
}
)
.emit();
result = Err(reported);
}
},
s if generics.params.iter().any(|param| param.name == s) => (),
s => {
result = Err(struct_span_err!(
tcx.sess,
span,
E0230,
"there is no parameter `{}` on {}",
s,
if trait_def_id == item_def_id {
format!("trait `{}`", trait_name)
} else {
"impl".to_string()
}
)
.emit());
}
}
}
// `{:1}` and `{}` are not to be used
Expand Down