add testcase for long expression

Author: chenyukang

tests/ui/lint/unused/closure-body-issue-136741.fixed

@@ -1,6 +1,15 @@
 //@ run-rustfix
+// ignore-tidy-linelength
 #![deny(unused_parens)]
 #![deny(unused_braces)]
+
+fn long_expr_that_does_not_require_braces_long_expr_that_does_not_require_braces_long_expr_that_does_not_require_braces()
+{}
+
+fn func(f: impl FnOnce()) {
+    f()
+}
+
 pub fn main() {
     let _closure = |x: i32, y: i32| x * (x + (y * 2)); //~ ERROR unnecessary braces around closure body
     let _ = || 0 == 0; //~ ERROR unnecessary parentheses around closure body
@@ -19,4 +28,9 @@ pub fn main() {
         _ = 0;
         0 == 0 //~ ERROR unnecessary parentheses around block return value
     };
+
+    // long expressions will not lint with braces
+    func(|| {
+        long_expr_that_does_not_require_braces_long_expr_that_does_not_require_braces_long_expr_that_does_not_require_braces()
+    })
 }

tests/ui/lint/unused/closure-body-issue-136741.rs

@@ -1,6 +1,15 @@
 //@ run-rustfix
+// ignore-tidy-linelength
 #![deny(unused_parens)]
 #![deny(unused_braces)]
+
+fn long_expr_that_does_not_require_braces_long_expr_that_does_not_require_braces_long_expr_that_does_not_require_braces()
+{}
+
+fn func(f: impl FnOnce()) {
+    f()
+}
+
 pub fn main() {
     let _closure = |x: i32, y: i32| { x * (x + (y * 2)) }; //~ ERROR unnecessary braces around closure body
     let _ = || (0 == 0); //~ ERROR unnecessary parentheses around closure body
@@ -21,4 +30,9 @@ pub fn main() {
         _ = 0;
         (0 == 0) //~ ERROR unnecessary parentheses around block return value
     };
+
+    // long expressions will not lint with braces
+    func(|| {
+        long_expr_that_does_not_require_braces_long_expr_that_does_not_require_braces_long_expr_that_does_not_require_braces()
+    })
 }

tests/ui/lint/unused/closure-body-issue-136741.stderr

@@ -1,11 +1,11 @@
 error: unnecessary braces around closure body
-  --> $DIR/closure-body-issue-136741.rs:5:37
+  --> $DIR/closure-body-issue-136741.rs:14:37
    |
 LL |     let _closure = |x: i32, y: i32| { x * (x + (y * 2)) };
    |                                     ^^                 ^^
    |
 note: the lint level is defined here
-  --> $DIR/closure-body-issue-136741.rs:3:9
+  --> $DIR/closure-body-issue-136741.rs:4:9
    |
 LL | #![deny(unused_braces)]
    |         ^^^^^^^^^^^^^
@@ -16,13 +16,13 @@ LL +     let _closure = |x: i32, y: i32| x * (x + (y * 2));
    |
 
 error: unnecessary parentheses around closure body
-  --> $DIR/closure-body-issue-136741.rs:6:16
+  --> $DIR/closure-body-issue-136741.rs:15:16
    |
 LL |     let _ = || (0 == 0);
    |                ^      ^
    |
 note: the lint level is defined here
-  --> $DIR/closure-body-issue-136741.rs:2:9
+  --> $DIR/closure-body-issue-136741.rs:3:9
    |
 LL | #![deny(unused_parens)]
    |         ^^^^^^^^^^^^^
@@ -33,7 +33,7 @@ LL +     let _ = || 0 == 0;
    |
 
 error: unnecessary parentheses around closure body
-  --> $DIR/closure-body-issue-136741.rs:7:28
+  --> $DIR/closure-body-issue-136741.rs:16:28
    |
 LL |     let _ = (0..).find(|n| (n % 2 == 0));
    |                            ^          ^
@@ -45,7 +45,7 @@ LL +     let _ = (0..).find(|n| n % 2 == 0);
    |
 
 error: unnecessary braces around closure body
-  --> $DIR/closure-body-issue-136741.rs:8:28
+  --> $DIR/closure-body-issue-136741.rs:17:28
    |
 LL |     let _ = (0..).find(|n| {n % 2 == 0});
    |                            ^          ^
@@ -57,7 +57,7 @@ LL +     let _ = (0..).find(|n| n % 2 == 0);
    |
 
 error: unnecessary parentheses around closure body
-  --> $DIR/closure-body-issue-136741.rs:16:28
+  --> $DIR/closure-body-issue-136741.rs:25:28
    |
 LL |        let _ = (0..).find(|n| (
    |  _____________________________^
@@ -76,7 +76,7 @@ LL +     let _ = (0..).find(|n| n % 2 == 0);
    |
 
 error: unnecessary parentheses around block return value
-  --> $DIR/closure-body-issue-136741.rs:22:9
+  --> $DIR/closure-body-issue-136741.rs:31:9
    |
 LL |         (0 == 0)
    |         ^      ^