Adding alignment to the list of cases to test for specific error message. Covers `>`, `^` and `<`.

1 files changed, 22 insertions, 6 deletions

diff --git a/compiler/rustc_parse_format/src/lib.rs b/compiler/rustc_parse_format/src/lib.rs
index e886db3da29..eff54ac9308 100644
--- a/compiler/rustc_parse_format/src/lib.rs
+++ b/compiler/rustc_parse_format/src/lib.rs
@@ -289,10 +289,10 @@ impl<'a> Iterator for Parser<'a> {
                             }
                         } else {
                             if let Some(&(_, maybe)) = self.cur.peek() {
-                                if maybe == '?' {
-                                    self.suggest_format();
-                                } else {
-                                    self.suggest_positional_arg_instead_of_captured_arg(arg);
+                                match maybe {
+                                    '?' => self.suggest_format_debug(),
+                                    '<' | '^' | '>' => self.suggest_format_align(maybe),
+                                    _ => self.suggest_positional_arg_instead_of_captured_arg(arg),
                                 }
                             }
                         }
@@ -868,10 +868,9 @@ impl<'a> Parser<'a> {
         found.then_some(cur)
     }
 
-    fn suggest_format(&mut self) {
+    fn suggest_format_debug(&mut self) {
         if let (Some(pos), Some(_)) = (self.consume_pos('?'), self.consume_pos(':')) {
             let word = self.word();
-            let _end = self.current_pos();
             let pos = self.to_span_index(pos);
             self.errors.insert(
                 0,
@@ -887,6 +886,23 @@ impl<'a> Parser<'a> {
         }
     }
 
+    fn suggest_format_align(&mut self, alignment: char) {
+        if let Some(pos) = self.consume_pos(alignment) {
+            let pos = self.to_span_index(pos);
+            self.errors.insert(
+                0,
+                ParseError {
+                    description: "expected format parameter to occur after `:`".to_owned(),
+                    note: Some(format!("`{}` comes after `:`.", alignment)),
+                    label: format!("expected `{}` to occur after `:`", alignment).to_owned(),
+                    span: pos.to(pos),
+                    secondary_label: None,
+                    suggestion: Suggestion::None,
+                },
+            );
+        }
+    }
+
     fn suggest_positional_arg_instead_of_captured_arg(&mut self, arg: Argument<'a>) {
         if let Some(end) = self.consume_pos('.') {
             let byte_pos = self.to_span_index(end);