Improve error message when closing bracket interpreted as formatting fill character

2 files changed, 20 insertions, 0 deletions

diff --git a/tests/ui/fmt/closing-brace-as-fill.rs b/tests/ui/fmt/closing-brace-as-fill.rs
new file mode 100644
index 00000000000..6ad257f943e
--- /dev/null
+++ b/tests/ui/fmt/closing-brace-as-fill.rs
@@ -0,0 +1,8 @@
+// issue: 112732
+
+// `}` is typoed since it is interpreted as a fill character rather than a closing bracket
+
+fn main() {
+    println!("Hello, world! {0:}<3", 2);
+    //~^ ERROR invalid format string: expected `'}'` but string was terminated
+}
diff --git a/tests/ui/fmt/closing-brace-as-fill.stderr b/tests/ui/fmt/closing-brace-as-fill.stderr
new file mode 100644
index 00000000000..aa1e5aff652
--- /dev/null
+++ b/tests/ui/fmt/closing-brace-as-fill.stderr
@@ -0,0 +1,12 @@
+error: invalid format string: expected `'}'` but string was terminated
+  --> $DIR/closing-brace-as-fill.rs:6:35
+   |
+LL |     println!("Hello, world! {0:}<3", 2);
+   |                                -  ^ expected `'}'` in format string
+   |                                |
+   |                                this is not interpreted as a formatting closing brace
+   |
+   = note: the character `'}'` is interpreted as a fill character because of the `:` that precedes it
+
+error: aborting due to previous error
+