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authorbors[bot] <26634292+bors[bot]@users.noreply.github.com>2021-04-13 12:39:03 +0100
committerGitHub <[email protected]>2021-04-13 12:39:03 +0100
commite6728a8cd39f9111dcdd654c7c65e99e5a2f1190 (patch)
tree2532d24e0c10c7e3284033df4256f7adf96d2e82 /docs
parent0c02208fd8d9ff3ce8184e2eb5dba915d5b54656 (diff)
parent09a78caca403f1b4be8711d00519094896928e58 (diff)
Merge #8415
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 <[email protected]>
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