Fix inf loop in parser (#4803)

core/src/syn/parser/idiom.rs

@@ -185,6 +185,8 @@ impl Parser<'_> {
 						if let Some(x) = self.parse_graph_idiom(ctx, &mut res, Dir::Both).await? {
 							return Ok(x);
 						}
+					} else {
+						break;
 					}
 				}
 				t!("..") => {

core/src/syn/parser/test/mod.rs

@@ -47,6 +47,16 @@ fn glued_identifiers() {
 	assert_eq!(res, expected);
 }
 
+#[test]
+fn less_then_idiom() {
+	let src = r#"
+		if ($param.foo < 2){
+			return 1
+		}
+	"#;
+	test_parse!(parse_query, src).unwrap();
+}
+
 #[test]
 fn escaped_params() {
 	let src = r#"LET $⟨R-_fYU8Wa31kg7tz0JI6Kme⟩ = 5;