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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/E0750.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/E0750.md')
-rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0750.md | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes/E0750.md b/compiler/rustc_error_codes/src/error_codes/E0750.md new file mode 100644 index 000000000..905e852f8 --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0750.md @@ -0,0 +1,18 @@ +A negative impl was made default impl. + +Erroneous code example: + +```compile_fail,E0750 +# #![feature(negative_impls)] +# #![feature(specialization)] +trait MyTrait { + type Foo; +} + +default impl !MyTrait for u32 {} // error! +# fn main() {} +``` + +Negative impls cannot be default impls. A default impl supplies default values +for the items within to be used by other impls, whereas a negative impl declares +that there are no other impls. Combining it does not make sense. |