mirror of
https://github.com/rust-lang/rust-analyzer.git
synced 2025-10-31 12:04:43 +00:00
120 lines
3.1 KiB
Rust
120 lines
3.1 KiB
Rust
use hir::InFile;
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use crate::{Diagnostic, DiagnosticCode, DiagnosticsContext};
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// Diagnostic: trait-impl-orphan
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//
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// Only traits defined in the current crate can be implemented for arbitrary types
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pub(crate) fn trait_impl_orphan(
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ctx: &DiagnosticsContext<'_>,
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d: &hir::TraitImplOrphan,
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) -> Diagnostic {
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Diagnostic::new_with_syntax_node_ptr(
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ctx,
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DiagnosticCode::RustcHardError("E0117"),
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"only traits defined in the current crate can be implemented for arbitrary types"
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.to_owned(),
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InFile::new(d.file_id, d.impl_.into()),
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)
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// Not yet checked for false positives
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.experimental()
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}
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#[cfg(test)]
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mod tests {
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use crate::tests::check_diagnostics;
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#[test]
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fn simple() {
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check_diagnostics(
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r#"
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//- /foo.rs crate:foo
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pub trait Foo {}
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//- /bar.rs crate:bar
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pub struct Bar;
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//- /main.rs crate:main deps:foo,bar
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struct LocalType;
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trait LocalTrait {}
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impl foo::Foo for bar::Bar {}
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//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: only traits defined in the current crate can be implemented for arbitrary types
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impl foo::Foo for LocalType {}
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impl LocalTrait for bar::Bar {}
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"#,
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);
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}
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#[test]
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fn generics() {
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check_diagnostics(
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r#"
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//- /foo.rs crate:foo
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pub trait Foo<T> {}
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//- /bar.rs crate:bar
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pub struct Bar<T>(T);
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//- /main.rs crate:main deps:foo,bar
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struct LocalType<T>;
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trait LocalTrait<T> {}
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impl<T> foo::Foo<T> for bar::Bar<T> {}
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//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: only traits defined in the current crate can be implemented for arbitrary types
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impl<T> foo::Foo<T> for bar::Bar<LocalType<T>> {}
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//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: only traits defined in the current crate can be implemented for arbitrary types
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impl<T> foo::Foo<LocalType<T>> for bar::Bar<T> {}
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impl<T> foo::Foo<bar::Bar<LocalType<T>>> for bar::Bar<LocalType<T>> {}
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//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: only traits defined in the current crate can be implemented for arbitrary types
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"#,
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);
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}
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#[test]
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fn fundamental() {
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check_diagnostics(
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r#"
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//- /foo.rs crate:foo
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pub trait Foo<T> {}
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//- /bar.rs crate:bar
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pub struct Bar<T>(T);
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#[lang = "owned_box"]
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#[fundamental]
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pub struct Box<T>(T);
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//- /main.rs crate:main deps:foo,bar
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struct LocalType;
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impl<T> foo::Foo<T> for bar::Box<T> {}
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//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: only traits defined in the current crate can be implemented for arbitrary types
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impl<T> foo::Foo<T> for &LocalType {}
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impl<T> foo::Foo<T> for bar::Box<LocalType> {}
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"#,
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);
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}
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#[test]
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fn dyn_object() {
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check_diagnostics(
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r#"
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//- /foo.rs crate:foo
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pub trait Foo<T> {}
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//- /bar.rs crate:bar
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pub struct Bar;
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//- /main.rs crate:main deps:foo,bar
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trait LocalTrait {}
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impl<T> foo::Foo<T> for dyn LocalTrait {}
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impl<T> foo::Foo<dyn LocalTrait> for Bar {}
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"#,
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);
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}
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#[test]
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fn twice_fundamental() {
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check_diagnostics(
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r#"
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//- /foo.rs crate:foo
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pub trait Trait {}
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//- /bar.rs crate:bar deps:foo
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struct Foo;
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impl foo::Trait for &&Foo {}
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"#,
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);
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}
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}
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