- let generics = self.tcx.generics_of(def_id);
- if generics.params.iter().any(|p| p.name != kw::SelfUpper)
- && !snippet.ends_with('>')
- && !generics.has_impl_trait()
- && !self.tcx.is_fn_trait(def_id)
- {
- // FIXME: To avoid spurious suggestions in functions where type arguments
- // where already supplied, we check the snippet to make sure it doesn't
- // end with a turbofish. Ideally we would have access to a `PathSegment`
- // instead. Otherwise we would produce the following output:
- //
- // error[E0283]: type annotations needed
- // --> $DIR/issue-54954.rs:3:24
- // |
- // LL | const ARR_LEN: usize = Tt::const_val::<[i8; 123]>();
- // | ^^^^^^^^^^^^^^^^^^^^^^^^^^
- // | |
- // | cannot infer type
- // | help: consider specifying the type argument
- // | in the function call:
- // | `Tt::const_val::<[i8; 123]>::<T>`
- // ...
- // LL | const fn const_val<T: Sized>() -> usize {
- // | - required by this bound in `Tt::const_val`
- // |
- // = note: cannot satisfy `_: Tt`
-
- // Clear any more general suggestions in favor of our specific one
- err.clear_suggestions();
-
- err.span_suggestion_verbose(
- span.shrink_to_hi(),
- &format!(
- "consider specifying the type argument{} in the function call",
- pluralize!(generics.params.len()),
- ),
- format!(
- "::<{}>",
- generics
- .params
- .iter()
- .map(|p| p.name.to_string())
- .collect::<Vec<String>>()
- .join(", ")
- ),
- Applicability::HasPlaceholders,
- );
- }