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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /compiler/rustc_error_codes/src/error_codes/E0212.md | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'compiler/rustc_error_codes/src/error_codes/E0212.md')
-rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0212.md | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes/E0212.md b/compiler/rustc_error_codes/src/error_codes/E0212.md new file mode 100644 index 000000000..174654146 --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0212.md @@ -0,0 +1,35 @@ +Cannot use the associated type of +a trait with uninferred generic parameters. + +Erroneous code example: + +```compile_fail,E0212 +pub trait Foo<T> { + type A; + + fn get(&self, t: T) -> Self::A; +} + +fn foo2<I : for<'x> Foo<&'x isize>>( + field: I::A) {} // error! +``` + +In this example, we have to instantiate `'x`, and +we don't know what lifetime to instantiate it with. +To fix this, spell out the precise lifetimes involved. +Example: + +``` +pub trait Foo<T> { + type A; + + fn get(&self, t: T) -> Self::A; +} + +fn foo3<I : for<'x> Foo<&'x isize>>( + x: <I as Foo<&isize>>::A) {} // ok! + + +fn foo4<'a, I : for<'x> Foo<&'x isize>>( + x: <I as Foo<&'a isize>>::A) {} // ok! +``` |