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[ty] Improve several "Did you mean?" suggestions (#21597)

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Alex Waygood 2025-11-25 10:29:01 +00:00 committed by GitHub
parent 747c39a26a
commit b19ddca69b
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7 changed files with 183 additions and 64 deletions
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3
crates/ty_python_semantic/resources/mdtest/annotations/literal_string.md
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@ -35,6 +35,8 @@ bad_nesting: Literal[LiteralString] # error: [invalid-type-form]
`LiteralString` cannot be parameterized.
<!-- snapshot-diagnostics -->
```py
from typing_extensions import LiteralString
@ -42,7 +44,6 @@ from typing_extensions import LiteralString
a: LiteralString[str]
# error: [invalid-type-form]
# error: [unresolved-reference] "Name `foo` used when not defined"
b: LiteralString["foo"]
```

10
crates/ty_python_semantic/resources/mdtest/snapshots/invalid.md_-_Tests_for_invalid_ty…_-_Diagnostics_for_comm…_-_Module-literal_used_…_(652fec4fd4a6c63a).snap
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@ -34,29 +34,27 @@ mdtest path: crates/ty_python_semantic/resources/mdtest/annotations/invalid.md
# Diagnostics
```
error[invalid-type-form]: Variable of type `<module 'datetime'>` is not allowed in a type expression
error[invalid-type-form]: Module `datetime` is not valid in a type expression
--> src/foo.py:3:10
|
1 | import datetime
2 |
3 | def f(x: datetime): ... # error: [invalid-type-form]
| ^^^^^^^^
| ^^^^^^^^ Did you mean to use the module's member `datetime.datetime`?
|
info: Did you mean to use the module's member `datetime.datetime` instead?
info: rule `invalid-type-form` is enabled by default
```
```
error[invalid-type-form]: Variable of type `<module 'PIL.Image'>` is not allowed in a type expression
error[invalid-type-form]: Module `PIL.Image` is not valid in a type expression
--> src/bar.py:3:10
|
1 | from PIL import Image
2 |
3 | def g(x: Image): ... # error: [invalid-type-form]
| ^^^^^
| ^^^^^ Did you mean to use the module's member `Image.Image`?
|
info: Did you mean to use the module's member `Image.Image` instead?
info: rule `invalid-type-form` is enabled by default
```

52
crates/ty_python_semantic/resources/mdtest/snapshots/literal_string.md_-_`LiteralString`_-_Usages_-_Parameterized_(ec84ce49ea235791).snap Normal file
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@ -0,0 +1,52 @@
---
source: crates/ty_test/src/lib.rs
expression: snapshot
---
---
mdtest name: literal_string.md - `LiteralString` - Usages - Parameterized
mdtest path: crates/ty_python_semantic/resources/mdtest/annotations/literal_string.md
---
# Python source files
## mdtest_snippet.py
```
1 | from typing_extensions import LiteralString
2 |
3 | # error: [invalid-type-form]
4 | a: LiteralString[str]
5 |
6 | # error: [invalid-type-form]
7 | b: LiteralString["foo"]
```
# Diagnostics
```
error[invalid-type-form]: `LiteralString` expects no type parameter
--> src/mdtest_snippet.py:4:4
|
3 | # error: [invalid-type-form]
4 | a: LiteralString[str]
| ^^^^^^^^^^^^^^^^^^
5 |
6 | # error: [invalid-type-form]
|
info: rule `invalid-type-form` is enabled by default
```
```
error[invalid-type-form]: `LiteralString` expects no type parameter
--> src/mdtest_snippet.py:7:4
|
6 | # error: [invalid-type-form]
7 | b: LiteralString["foo"]
| -------------^^^^^^^
| |
| Did you mean `Literal`?
|
info: rule `invalid-type-form` is enabled by default
```

34
crates/ty_python_semantic/resources/mdtest/snapshots/typed_dict.md_-_`TypedDict`_-_Error_cases_-_`typing.TypedDict`_i…_(9df67eb93e3df341).snap Normal file
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@ -0,0 +1,34 @@
---
source: crates/ty_test/src/lib.rs
expression: snapshot
---
---
mdtest name: typed_dict.md - `TypedDict` - Error cases - `typing.TypedDict` is not allowed in type expressions
mdtest path: crates/ty_python_semantic/resources/mdtest/typed_dict.md
---
# Python source files
## mdtest_snippet.py
```
1 | from typing import TypedDict
2 |
3 | # error: [invalid-type-form] "The special form `typing.TypedDict` is not allowed in type expressions"
4 | x: TypedDict = {"name": "Alice"}
```
# Diagnostics
```
error[invalid-type-form]: The special form `typing.TypedDict` is not allowed in type expressions
--> src/mdtest_snippet.py:4:4
|
3 | # error: [invalid-type-form] "The special form `typing.TypedDict` is not allowed in type expressions"
4 | x: TypedDict = {"name": "Alice"}
| ^^^^^^^^^
|
help: You might have meant to use a concrete TypedDict or `collections.abc.Mapping[str, object]`
info: rule `invalid-type-form` is enabled by default
```

4
crates/ty_python_semantic/resources/mdtest/typed_dict.md
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@ -1407,10 +1407,12 @@ msg.content
### `typing.TypedDict` is not allowed in type expressions
<!-- snapshot-diagnostics -->
```py
from typing import TypedDict
# error: [invalid-type-form] "The special form `typing.TypedDict` is not allowed in type expressions."
# error: [invalid-type-form] "The special form `typing.TypedDict` is not allowed in type expressions"
x: TypedDict = {"name": "Alice"}
```

55
crates/ty_python_semantic/src/types.rs
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@ -8597,25 +8597,23 @@ impl<'db> InvalidTypeExpression<'db> {
InvalidTypeExpression::Field => {
f.write_str("`dataclasses.Field` is not allowed in type expressions")
}
InvalidTypeExpression::ConstraintSet => {
f.write_str("`ty_extensions.ConstraintSet` is not allowed in type expressions")
}
InvalidTypeExpression::GenericContext => {
f.write_str("`ty_extensions.GenericContext` is not allowed in type expressions")
}
InvalidTypeExpression::Specialization => {
f.write_str("`ty_extensions.GenericContext` is not allowed in type expressions")
}
InvalidTypeExpression::TypedDict => {
f.write_str(
"The special form `typing.TypedDict` is not allowed in type expressions. \
Did you mean to use a concrete TypedDict or `collections.abc.Mapping[str, object]` instead?")
}
InvalidTypeExpression::TypeAlias => {
f.write_str(
"`typing.TypeAlias` is only allowed as the sole annotation on an annotated assignment",
)
}
InvalidTypeExpression::ConstraintSet => f.write_str(
"`ty_extensions.ConstraintSet` is not allowed in type expressions",
),
InvalidTypeExpression::GenericContext => f.write_str(
"`ty_extensions.GenericContext` is not allowed in type expressions",
),
InvalidTypeExpression::Specialization => f.write_str(
"`ty_extensions.GenericContext` is not allowed in type expressions",
),
InvalidTypeExpression::TypedDict => f.write_str(
"The special form `typing.TypedDict` \
is not allowed in type expressions",
),
InvalidTypeExpression::TypeAlias => f.write_str(
"`typing.TypeAlias` is only allowed \
as the sole annotation on an annotated assignment",
),
InvalidTypeExpression::TypeQualifier(qualifier) => write!(
f,
"Type qualifier `{qualifier}` is not allowed in type expressions \
@ -8626,6 +8624,11 @@ impl<'db> InvalidTypeExpression<'db> {
"Type qualifier `{qualifier}` is not allowed in type expressions \
(only in annotation expressions, and only with exactly one argument)",
),
InvalidTypeExpression::InvalidType(Type::ModuleLiteral(module), _) => write!(
f,
"Module `{module}` is not valid in a type expression",
module = module.module(self.db).name(self.db)
),
InvalidTypeExpression::InvalidType(ty, _) => write!(
f,
"Variable of type `{ty}` is not allowed in a type expression",
@ -8639,9 +8642,7 @@ impl<'db> InvalidTypeExpression<'db> {
}
fn add_subdiagnostics(self, db: &'db dyn Db, mut diagnostic: LintDiagnosticGuard) {
let InvalidTypeExpression::InvalidType(ty, scope) = self else {
return;
};
if let InvalidTypeExpression::InvalidType(ty, scope) = self {
let Type::ModuleLiteral(module_type) = ty else {
return;
};
@ -8664,10 +8665,16 @@ impl<'db> InvalidTypeExpression<'db> {
}
// TODO: showing a diff (and even having an autofix) would be even better
diagnostic.info(format_args!(
diagnostic.set_primary_message(format_args!(
"Did you mean to use the module's member \
`{module_name_final_part}.{module_name_final_part}` instead?"
`{module_name_final_part}.{module_name_final_part}`?"
));
} else if let InvalidTypeExpression::TypedDict = self {
diagnostic.help(
"You might have meant to use a concrete TypedDict \
or `collections.abc.Mapping[str, object]`",
);
}
}
}

43
crates/ty_python_semantic/src/types/infer/builder/type_expression.rs
View File

@ -148,15 +148,13 @@ impl<'db> TypeInferenceBuilder<'db, '_> {
// anything else is an invalid annotation:
op => {
self.infer_binary_expression(binary, TypeContext::default());
if let Some(mut diag) = self.report_invalid_type_expression(
self.report_invalid_type_expression(
expression,
format_args!(
"Invalid binary operator `{}` in type annotation",
op.as_str()
),
) {
diag.info("Did you mean to use `|`?");
}
);
Type::unknown()
}
}
@ -1446,13 +1444,40 @@ impl<'db> TypeInferenceBuilder<'db, '_> {
Type::unknown()
}
SpecialFormType::LiteralString => {
self.infer_type_expression(arguments_slice);
let arguments = self.infer_expression(arguments_slice, TypeContext::default());
if let Some(builder) = self.context.report_lint(&INVALID_TYPE_FORM, subscript) {
let mut diag = builder.into_diagnostic(format_args!(
"Type `{special_form}` expected no type parameter",
));
diag.info("Did you mean to use `Literal[...]` instead?");
let mut diag =
builder.into_diagnostic("`LiteralString` expects no type parameter");
let arguments_as_tuple = arguments.exact_tuple_instance_spec(db);
let mut argument_elements = arguments_as_tuple
.as_ref()
.map(|tup| Either::Left(tup.all_elements().copied()))
.unwrap_or(Either::Right(std::iter::once(arguments)));
let probably_meant_literal = argument_elements.all(|ty| match ty {
Type::StringLiteral(_)
| Type::BytesLiteral(_)
| Type::EnumLiteral(_)
| Type::BooleanLiteral(_) => true,
Type::NominalInstance(instance) => {
instance.has_known_class(db, KnownClass::NoneType)
}
_ => false,
});
if probably_meant_literal {
diag.annotate(
self.context
.secondary(&*subscript.value)
.message("Did you mean `Literal`?"),
);
diag.set_concise_message(
"`LiteralString` expects no type parameter - did you mean `Literal`?",
);
}
}
Type::unknown()
}