Auto merge of rust-lang#14540 - AmrDeveloper:disallow_extract_fun_single_brace, r=Veykril

Fix allow extracting function from single brace of block expression

Fix allow extracting function when selecting either `{` or `}`

Fix rust-lang#14514

Author: bors

crates/ide-assists/src/handlers/extract_function.rs

@@ -70,6 +70,11 @@ pub(crate) fn extract_function(acc: &mut Assists, ctx: &AssistContext<'_>) -> Op
     }
 
     let node = ctx.covering_element();
+    if matches!(node.kind(), T!['{'] | T!['}'] | T!['('] | T![')'] | T!['['] | T![']']) {
+        cov_mark::hit!(extract_function_in_braces_is_not_applicable);
+        return None;
+    }
+
     if node.kind() == COMMENT {
         cov_mark::hit!(extract_function_in_comment_is_not_applicable);
         return None;
@@ -5800,4 +5805,40 @@ fn $0fun_name() -> ControlFlow<()> {
 "#,
         );
     }
+
+    #[test]
+    fn in_left_curly_is_not_applicable() {
+        cov_mark::check!(extract_function_in_braces_is_not_applicable);
+        check_assist_not_applicable(extract_function, r"fn foo() { $0}$0");
+    }
+
+    #[test]
+    fn in_right_curly_is_not_applicable() {
+        cov_mark::check!(extract_function_in_braces_is_not_applicable);
+        check_assist_not_applicable(extract_function, r"fn foo() $0{$0 }");
+    }
+
+    #[test]
+    fn in_left_paren_is_not_applicable() {
+        cov_mark::check!(extract_function_in_braces_is_not_applicable);
+        check_assist_not_applicable(extract_function, r"fn foo( $0)$0 { }");
+    }
+
+    #[test]
+    fn in_right_paren_is_not_applicable() {
+        cov_mark::check!(extract_function_in_braces_is_not_applicable);
+        check_assist_not_applicable(extract_function, r"fn foo $0($0 ) { }");
+    }
+
+    #[test]
+    fn in_left_brack_is_not_applicable() {
+        cov_mark::check!(extract_function_in_braces_is_not_applicable);
+        check_assist_not_applicable(extract_function, r"fn foo(arr: &mut [i32$0]$0) {}");
+    }
+
+    #[test]
+    fn in_right_brack_is_not_applicable() {
+        cov_mark::check!(extract_function_in_braces_is_not_applicable);
+        check_assist_not_applicable(extract_function, r"fn foo(arr: &mut $0[$0i32]) {}");
+    }
 }