add more testcase for issue 68987

Author: chenyukang

compiler/rustc_parse/src/lexer/tokentrees.rs

@@ -279,7 +279,7 @@ impl<'a> TokenTreesReader<'a> {
                 "...as it matches this but it has different indentation",
             );
 
-             // If there is a empty block in the mismatched span, note it
+            // If there is a empty block in the mismatched span, note it
             for span in self.empty_block_spans.keys() {
                 if let Some(d) = self.empty_block_spans.get(span) &&
                         *d == delim && block_span.contains(*span) {

src/test/ui/parser/issue-68987-unmatch-issue-2.rs

@@ -0,0 +1,12 @@
+async fn obstest() -> Result<> {
+    let obs_connect = || -> Result<(), MyError) { //~ ERROR mismatched closing delimiter
+        async {
+        }
+    }
+
+    if let Ok(version, scene_list) = obs_connect() {
+
+    } else {
+
+    }
+} //~ ERROR unexpected closing delimiter

src/test/ui/parser/issue-68987-unmatch-issue-2.stderr

@@ -0,0 +1,16 @@
+error: unexpected closing delimiter: `}`
+  --> $DIR/issue-68987-unmatch-issue-2.rs:12:1
+   |
+LL | }
+   | ^ unexpected closing delimiter
+
+error: mismatched closing delimiter: `)`
+  --> $DIR/issue-68987-unmatch-issue-2.rs:1:32
+   |
+LL | async fn obstest() -> Result<> {
+   |                                ^ unclosed delimiter
+LL |     let obs_connect = || -> Result<(), MyError) {
+   |                                               ^ mismatched closing delimiter
+
+error: aborting due to 2 previous errors
+

src/test/ui/parser/issue-68987-unmatch-issue-3.rs

@@ -0,0 +1,7 @@
+fn f(i: u32, j: u32) {
+    let res = String::new();
+    let mut cnt = i;
+    while cnt < j {
+        write!&mut res, " "); //~ ERROR mismatched closing delimiter
+    }
+} //~ ERROR unexpected closing delimiter

src/test/ui/parser/issue-68987-unmatch-issue-3.stderr

@@ -0,0 +1,21 @@
+error: unexpected closing delimiter: `}`
+  --> $DIR/issue-68987-unmatch-issue-3.rs:7:1
+   |
+LL | fn f(i: u32, j: u32) {
+   |                      - this delimiter might not be properly closed...
+...
+LL |     }
+   |     - ...as it matches this but it has different indentation
+LL | }
+   | ^ unexpected closing delimiter
+
+error: mismatched closing delimiter: `)`
+  --> $DIR/issue-68987-unmatch-issue-3.rs:4:19
+   |
+LL |     while cnt < j {
+   |                   ^ unclosed delimiter
+LL |         write!&mut res, " ");
+   |                            ^ mismatched closing delimiter
+
+error: aborting due to 2 previous errors
+