Fix off by one error and add ui test.

2022-07-20 13:40:45 +01:00
parent 62187b12c2
commit f8dfc4bf35
3 changed files with 17 additions and 3 deletions
--- a/compiler/rustc_builtin_macros/src/format.rs
+++ b/compiler/rustc_builtin_macros/src/format.rs
@@ -485,7 +485,7 @@ impl<'a, 'b> Context<'a, 'b> {
            if let Some(span) = fmt.width_span {
                let span = self.fmtsp.from_inner(InnerSpan::new(span.start, span.end));
                match fmt.width {
-                    parse::CountIsParam(pos) if pos > self.num_args() => {
+                    parse::CountIsParam(pos) if pos >= self.num_args() => {
                        e.span_label(
                            span,
                            &format!(