Merge #536

536: Introduce variable semicolon block expr r=matklad a=yerke

Fix for https://github.com/rust-analyzer/rust-analyzer/issues/504

Feels a bit hacky...

Co-authored-by: Yerkebulan Tulibergenov <yerkebulan@gmail.com>

crates/ra_ide_api_light/src/assists/introduce_variable.rs

@@ -20,12 +20,16 @@ pub fn introduce_variable<'a>(ctx: AssistCtx) -> Option<Assist> {
 
         buf.push_str("let var_name = ");
         expr.syntax().text().push_to(&mut buf);
-        let is_full_stmt = if let Some(expr_stmt) = ast::ExprStmt::cast(anchor_stmt) {
+        let full_stmt = ast::ExprStmt::cast(anchor_stmt);
+        let is_full_stmt = if let Some(expr_stmt) = full_stmt {
             Some(expr.syntax()) == expr_stmt.expr().map(|e| e.syntax())
         } else {
             false
         };
         if is_full_stmt {
+            if !full_stmt.unwrap().has_semi() {
+                buf.push_str(";");
+            }
             edit.replace(expr.syntax().range(), buf);
         } else {
             buf.push_str(";");
@@ -141,4 +145,20 @@ fn foo() {
         );
     }
 
+    #[test]
+    fn test_introduce_var_block_expr_second_to_last() {
+        check_assist_range(
+            introduce_variable,
+            "
+fn foo() {
+    <|>{ let x = 0; x }<|>
+    something_else();
+}",
+            "
+fn foo() {
+    let <|>var_name = { let x = 0; x };
+    something_else();
+}",
+        );
+    }
 }

crates/ra_syntax/src/ast.rs

@@ -296,6 +296,15 @@ impl IfExpr {
     }
 }
 
+impl ExprStmt {
+    pub fn has_semi(&self) -> bool {
+        match self.syntax().last_child() {
+            None => false,
+            Some(node) => node.kind() == SEMI,
+        }
+    }
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum PathSegmentKind<'a> {
     Name(&'a NameRef),