1▶% Error Handling in Rust
2
3This content has moved into
· · ·
4▶[the Rust Programming Language book](book/ch09-00-error-handling.html).
5
2,420 matches across 25 files for error lang:Markdown lang:Markdown
4
5This flag will add `LintPass` to the start of the pipeline.
6▶You can use it to check for common errors in the LLVM IR generated by `rustc`.
7You can add `-Cllvm-args=-lint-abort-on-error` to abort the process if errors were found.
8
· · ·
7▶You can add `-Cllvm-args=-lint-abort-on-error` to abort the process if errors were found.
8
1▶#### Note: this error code is no longer emitted by the compiler
2
1▶#### Note: this error code is no longer emitted by the compiler.
2
1Formats the value using the given formatter.
2
3▶# Errors
4
5This function should return [`Err`] if, and only if, the provided [`Formatter`] returns [`Err`].
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6String formatting is considered an infallible operation; this function only
7returns a [`Result`] because writing to the underlying stream might fail and it must
8▶provide a way to propagate the fact that an error has occurred back up the stack.
9
1▶#### This error code is internal to the compiler and will not be emitted with normal Rust code.
2#### Note: this error code is no longer emitted by the compiler.
3
· · ·
2▶#### Note: this error code is no longer emitted by the compiler.
3
1▶#### This error code is internal to the compiler and will not be emitted with normal Rust code.
2#### Note: this error code is no longer emitted by the compiler.
3
· · ·
2▶#### Note: this error code is no longer emitted by the compiler.
3
1▶#### This error code is internal to the compiler and will not be emitted with normal Rust code.
2
5------------------------
6
7▶This flag converts the selected error to a [`bug!`] call, exiting the compiler immediately and allowing you to generate a backtrace of where the error occurred.
8For full documentation, see [the rustc-dev-guide][dev-guide-backtrace].
9
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11
12[`bug!`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/macro.bug.html
13▶[dev-guide-backtrace]: https://rustc-dev-guide.rust-lang.org/compiler-debugging.html#getting-a-backtrace-for-errors
14
4
5```compile_fail,E0763
6▶let c = b'a; // error!
7```
8
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9▶To fix this error, add the missing quote:
10
11```
1▶#### Note: this error code is no longer emitted by the compiler.
2
3This was triggered when multiple macro definitions used the same
· · ·
4▶`#[rustc_builtin_macro(..)]`. This is no longer an error.
5
1▶#### Note: this error code is no longer emitted by the compiler.
2
3The `#[rustc_on_unimplemented]` attribute used to raise this error for various
· · ·
3▶The `#[rustc_on_unimplemented]` attribute used to raise this error for various
4misuses of the attribute; these are now warnings.
5
4
5```compile_fail,E0768
6▶let s: i32 = 0b; // error!
7```
8
· · ·
9▶To fix this error, add the missing digits:
10
11```
1---
2▶name: Internal Compiler Error
3about: Create a report for an internal compiler error in rustc.
4labels: C-bug, I-ICE, T-compiler
· · ·
3▶about: Create a report for an internal compiler error in rustc.
4labels: C-bug, I-ICE, T-compiler
5title: "[ICE]: "
· · ·
6---
7<!--
8▶Thank you for finding an Internal Compiler Error! 🧊 If possible, try to provide
9a minimal verifiable example. You can read "Rust Bug Minimization Patterns" for
10how to create smaller examples.
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30```
31
32▶### Error output
33
34```
1▶# Reporting region errors
2
3TODO: we should discuss how to generate errors from the results of these analyses.
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3▶TODO: we should discuss how to generate errors from the results of these analyses.
4
4
5```compile_fail,E0762
6▶static C: char = '●; // error!
7```
8
· · ·
9▶To fix this error, add the missing quote:
10
11```
1▶#### Note: this error code is no longer emitted by the compiler.
2
3The `start` function was defined with a where clause.
4
5```compile_fail,E0765
6▶let s = "; // error!
7```
8
· · ·
9▶To fix this error, add the missing double quote at the end of the string:
10
11```
4
5```compile_fail,E0766
6▶let s = b"; // error!
7```
8
· · ·
9▶To fix this error, add the missing double quote at the end of the string:
10
11```
1▶#### Note: this error code is no longer emitted by the compiler.
2
3Const parameters cannot depend on type parameters.
· · ·
5
6```compile_fail,E0770
7▶fn const_id<T, const N: T>() -> T { // error
8 N
9}
30```
31
32▶When that is compiled, the compiler will error with something like
33
34```text
· · ·
35▶error: backend_repr: Aggregate { sized: true }
36 --> src/lib.rs:4:1
37 |
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42 | |_^
43
44▶error: size: Size { raw: 16 }
45 --> src/lib.rs:4:1
46 |
· · ·
51 | |_^
52
53▶error: aborting due to 2 previous errors
54```
55
1▶#### Note: this error code is no longer emitted by the compiler.
2
3More than one function was declared with the `#[start]` attribute.
4
5```compile_fail,E0770
6▶fn foo<T, const N: T>() {} // error!
7```
8
· · ·
9▶To fix this error, use a concrete type for the const parameter:
10
11```
1▶#### Note: this error code is no longer emitted by the compiler.
2
3You can't import a type or module when the name of the item being imported is
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4the same as another type or submodule defined in the module.
5
6▶An example of this error:
7
8```compile_fail
· · ·
9▶use foo::Bar; // error
10
11type Bar = u32;
1▶#### Note: this error code is no longer emitted by the compiler.
2
3A function with the `start` attribute was declared with type parameters.
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