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add a suggestion about undeclared alloc module

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This commit is contained in:
Takayuki Maeda
2021-11-03 01:44:01 +09:00
parent ff0e14829e
commit acb9f9ba38
4 changed files with 39 additions and 9 deletions
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28
compiler/rustc_resolve/src/lib.rs
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@@ -2523,19 +2523,29 @@ impl<'a> Resolver<'a> {
} else {
(
format!("use of undeclared crate or module `{}`", ident),
self.find_similarly_named_module_or_crate(
ident.name,
&parent_scope.module,
)
.map(|sugg| {
(
vec![(ident.span, sugg.to_string())],
if ident.name == sym::alloc {
Some((
vec![],
String::from(
"there is a crate or module with a similar name",
"add `extern crate alloc` to use the builtin `alloc` module",
),
Applicability::MaybeIncorrect,
))
} else {
self.find_similarly_named_module_or_crate(
ident.name,
&parent_scope.module,
)
}),
.map(|sugg| {
(
vec![(ident.span, sugg.to_string())],
String::from(
"there is a crate or module with a similar name",
),
Applicability::MaybeIncorrect,
)
})
},
)
}
} else {