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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/E0128.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/E0128.md')
-rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0128.md | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes/E0128.md b/compiler/rustc_error_codes/src/error_codes/E0128.md new file mode 100644 index 000000000..2ea8ae68e --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0128.md @@ -0,0 +1,25 @@ +A type parameter with default value is using forward declared identifier. + +Erroneous code example: + +```compile_fail,E0128 +struct Foo<T = U, U = ()> { + field1: T, + field2: U, +} +// error: generic parameters with a default cannot use forward declared +// identifiers +``` + +Type parameter defaults can only use parameters that occur before them. Since +type parameters are evaluated in-order, this issue could be fixed by doing: + +``` +struct Foo<U = (), T = U> { + field1: T, + field2: U, +} +``` + +Please also verify that this wasn't because of a name-clash and rename the type +parameter if so. |