mirror of
https://github.com/rust-lang/rust-analyzer
synced 2024-11-18 02:38:38 +00:00
e6728a8cd3
8415: Fix faulty assertion when extracting function with macro call r=matklad a=brandondong
**Reproduction:**
```rust
fn main() {
let n = 1;
let k = n * n;
dbg!(n);
}
```
1. Select the second and third lines of the main function. Use the "Extract into function" code assist.
2. Panic occurs in debug, error is logged in release: "[ERROR ide_assists::handlers::extract_function] assertion failed: matches!(path, ast :: Expr :: PathExpr(_))".
3. Function generates successfully on release where the panic was bypassed.
```rust
fn fun_name(n: i32) {
let k = n * n;
dbg!(n);
}
```
**Cause:**
- The generated function will take `n` as a parameter. The extraction logic needs to search the usages of `n` to determine whether it is used mutably or not. The helper `path_element_of_reference` is called for each usage but the second usage is a macro call and fails the `Expr::PathExpr(_)` match assertion.
- The caller of `path_element_of_reference` does implicitly assume it to be a `Expr::PathExpr(_)` in how it looks at its parent node for determining whether it is used mutably. This logic will not work for macros.
- I'm not sure if there are any other cases besides macros where it could be something other than a `Expr::PathExpr(_)`. I tried various examples and could not find any.
**Fix:**
- Update assertion to include the macro case.
- Add a FIXME to properly handle checking if a macro usage requires mutable access. For now, return false instead of running the existing logic that is tailored for `Expr::PathExpr(_)`'s.
Co-authored-by: Brandon <brandondong604@hotmail.com>
|
||
|---|---|---|
| .. | ||
| base_db | ||
| cfg | ||
| flycheck | ||
| hir | ||
| hir_def | ||
| hir_expand | ||
| hir_ty | ||
| ide | ||
| ide_assists | ||
| ide_completion | ||
| ide_db | ||
| ide_ssr | ||
| mbe | ||
| parser | ||
| paths | ||
| proc_macro_api | ||
| proc_macro_srv | ||
| proc_macro_test | ||
| profile | ||
| project_model | ||
| rust-analyzer | ||
| stdx | ||
| syntax | ||
| test_utils | ||
| text_edit | ||
| toolchain | ||
| tt | ||
| vfs | ||
| vfs-notify | ||