fix corner case in collapse_vars (#5018)

fixes #5017
2021-06-21 04:12:45 +01:00
parent e368d39715
commit 111366fca0
4 changed files with 33 additions and 10 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1820,7 +1820,7 @@ merge(Compressor.prototype, {
                    if (is_lhs(node, parent)) {
                        if (value_def && !hit_rhs) {
                            assign_used = true;
-                            replaced++;
+                            if (node.definition().last_ref === node) replaced++;
                        }
                        return node;
                    } else if (value_def) {
@@ -1946,10 +1946,9 @@ merge(Compressor.prototype, {
                    }
                }
                // Replace variable when found
-                if (node instanceof AST_SymbolRef
-                    && node.name == def.name) {
-                    if (!--replaced) abort = true;
+                if (node instanceof AST_SymbolRef && node.definition() === def) {
                    if (is_lhs(node, multi_replacer.parent())) return node;
+                    if (!--replaced) abort = true;
                    var ref = rvalue.clone();
                    ref.scope = node.scope;
                    ref.reference();