`manual_let_else` produces wrong variable name

[ericwu17]

Description

Take the following line of code (which appears in the ui test for manual_let_else):

let v = if let Some(v_some) = g() { v_some } else { return };

which declares a new variable called v. If we run clippy on the following code, we get the suggestion to replace it with

if let Some(v_some) = g() { v_some } else { return };

which declares a new variable called v_some.

The suggestion should be:

-if let Some(v_some) = g() { v_some } else { return };
+if let Some(v) = g() { v_some } else { return };

Please correct me if I'm wrong, but it looks like we have unit tests that are generating the wrong output.

Version

rustc 1.68.0-nightly (574b64a97 2022-12-31)
binary: rustc
commit-hash: 574b64a97f52162f965bc201e47f0af8279ca65d
commit-date: 2022-12-31
host: aarch64-apple-darwin
release: 1.68.0-nightly
LLVM version: 15.0.6

Additional Labels

No response

[est31]

As a workaround, you can use rust-analyzer's match-to-let-else assist. It doesn't fire 100% in the same set of instances that clippy fires, but its logic can edit patterns which fixes a lot of the issues with autosuggestions.

[est31]

Also this is a dupe of #9939