retrofit try-catch-finally as block-scoped (#4178)

- support optional catch binding
2020-10-04 22:30:14 +01:00
parent f9946767c9
commit 8f0521d51d
8 changed files with 74 additions and 19 deletions
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -1130,9 +1130,12 @@ function parse($TEXT, options) {
        if (is("keyword", "catch")) {
            var start = S.token;
            next();
-            expect("(");
-            var name = as_symbol(AST_SymbolCatch);
-            expect(")");
+            var name = null;
+            if (is("punc", "(")) {
+                next();
+                name = as_symbol(AST_SymbolCatch);
+                expect(")");
+            }
            bcatch = new AST_Catch({
                start   : start,
                argname : name,