Add hints for invalid identifier errors (#2583)

1 files changed, 8 insertions, 1 deletions

diff --git a/crates/typst-syntax/src/parser.rs b/crates/typst-syntax/src/parser.rs
index f1c798c6..9397952f 100644
--- a/crates/typst-syntax/src/parser.rs
+++ b/crates/typst-syntax/src/parser.rs
@@ -1685,7 +1685,14 @@ impl<'s> Parser<'s> {
         if at {
             self.eat();
         } else if kind == SyntaxKind::Ident && self.current.is_keyword() {
-            self.expected_found(kind.name(), self.current.name());
+            let found_text = self.current_text();
+            let found = self.current.name();
+            self.expected_found(kind.name(), found);
+            self.hint(eco_format!(
+                "{} is not allowed as an identifier; try `{}_` instead",
+                found,
+                found_text
+            ));
         } else {
             self.balanced &= !kind.is_grouping();
             self.expected(kind.name());