Add regression test for #58886

src/test/ui/parser/unclosed-delimiter-in-dep.rs

@@ -0,0 +1,6 @@
+mod unclosed_delim_mod;
+
+fn main() {
+    let _: usize = unclosed_delim_mod::new();
+    //~^ ERROR mismatched types
+}

src/test/ui/parser/unclosed-delimiter-in-dep.stderr

@@ -0,0 +1,23 @@
+error: incorrect close delimiter: `}`
+  --> $DIR/unclosed_delim_mod.rs:5:1
+   |
+LL | pub fn new() -> Result<Value, ()> {
+   |                                   - close delimiter possibly meant for this
+LL |     Ok(Value {
+   |       - un-closed delimiter
+LL |     }
+LL | }
+   | ^ incorrect close delimiter
+
+error[E0308]: mismatched types
+  --> $DIR/unclosed-delimiter-in-dep.rs:4:20
+   |
+LL |     let _: usize = unclosed_delim_mod::new();
+   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^ expected usize, found enum `std::result::Result`
+   |
+   = note: expected type `usize`
+              found type `std::result::Result<unclosed_delim_mod::Value, ()>`
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0308`.

src/test/ui/parser/unclosed_delim_mod.rs

@@ -0,0 +1,6 @@
+pub struct Value {}
+pub fn new() -> Result<Value, ()> {
+    Ok(Value {
+    }
+}
+//~^ ERROR incorrect close delimiter

src/test/ui/parser/unclosed_delim_mod.stderr

@@ -0,0 +1,18 @@
+error: incorrect close delimiter: `}`
+  --> $DIR/unclosed_delim_mod.rs:5:1
+   |
+LL | pub fn new() -> Result<Value, ()> {
+   |                                   - close delimiter possibly meant for this
+LL |     Ok(Value {
+   |       - un-closed delimiter
+LL |     }
+LL | }
+   | ^ incorrect close delimiter
+
+error[E0601]: `main` function not found in crate `unclosed_delim_mod`
+   |
+   = note: consider adding a `main` function to `$DIR/unclosed_delim_mod.rs`
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0601`.