Also conservatively check for spaces at the beginning of the pattern

crates/compiler/test_syntax/tests/test_snapshots.rs

@@ -289,6 +289,7 @@ mod test_snapshots {
         pass/ann_effectful_fn.expr,
         pass/ann_open_union.expr,
         pass/ann_parens_comments.expr,
+        pass/ann_pattern_comment_before_body.expr,
         pass/ann_record_pat_with_comment.expr,
         pass/ann_tag_union_newline_comment.expr,
         pass/annotate_tuple_func.expr,