Auto merge of #17481 - roife:fix-issue-17480, r=Veykril

fix: pattern completions in let-stmt

fix #17480.

We can write `let S { a, b } = s;` or `let Some(x) = a else {}`, so it is reasonable to allow pattern completions in `LetStmt`.

Author: bors

crates/ide-completion/src/context/analysis.rs

@@ -1334,7 +1334,7 @@ fn pattern_context_for(
         .map_or((PatternRefutability::Irrefutable, false), |node| {
             let refutability = match_ast! {
                 match node {
-                    ast::LetStmt(let_) => return (PatternRefutability::Irrefutable, let_.ty().is_some()),
+                    ast::LetStmt(let_) => return (PatternRefutability::Refutable, let_.ty().is_some()),
                     ast::Param(param) => {
                         let has_type_ascription = param.ty().is_some();
                         param_ctx = (|| {

crates/ide-completion/src/tests/pattern.rs

@@ -146,7 +146,7 @@ enum SingleVariantEnum {
 }
 use SingleVariantEnum::Variant;
 fn foo() {
-   let a$0
+   for a$0
 }
 "#,
         expect![[r#"