fix `reduce_vars` within try-block (#1818)

Possible partial execution due to exceptions.

1 files changed, 13 insertions, 1 deletions

diff --git a/lib/compress.js b/lib/compress.js
index 640fcecc..cc42c46e 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -382,7 +382,19 @@ merge(Compressor.prototype, {
                     pop();
                     return true;
                 }
-                if (node instanceof AST_Catch || node instanceof AST_SwitchBranch) {
+                if (node instanceof AST_Try) {
+                    push();
+                    walk_body(node, tw);
+                    pop();
+                    if (node.bcatch) {
+                        push();
+                        node.bcatch.walk(tw);
+                        pop();
+                    }
+                    if (node.bfinally) node.bfinally.walk(tw);
+                    return true;
+                }
+                if (node instanceof AST_SwitchBranch) {
                     push();
                     descend();
                     pop();