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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/E0434.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/E0434.md')
-rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0434.md | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes/E0434.md b/compiler/rustc_error_codes/src/error_codes/E0434.md new file mode 100644 index 000000000..8fd60412b --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0434.md @@ -0,0 +1,40 @@ +A variable used inside an inner function comes from a dynamic environment. + +Erroneous code example: + +```compile_fail,E0434 +fn foo() { + let y = 5; + fn bar() -> u32 { + y // error: can't capture dynamic environment in a fn item; use the + // || { ... } closure form instead. + } +} +``` + +Inner functions do not have access to their containing environment. To fix this +error, you can replace the function with a closure: + +``` +fn foo() { + let y = 5; + let bar = || { + y + }; +} +``` + +Or replace the captured variable with a constant or a static item: + +``` +fn foo() { + static mut X: u32 = 4; + const Y: u32 = 5; + fn bar() -> u32 { + unsafe { + X = 3; + } + Y + } +} +``` |