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-rw-r--r--lib/compress.js2
-rw-r--r--test/compress/collapse_vars.js27
2 files changed, 28 insertions, 1 deletions
diff --git a/lib/compress.js b/lib/compress.js
index 7e55da5a..03587359 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1367,7 +1367,7 @@ merge(Compressor.prototype, {
if (replace_all) return false;
return node instanceof AST_SymbolRef
&& !node.is_declared(compressor)
- && !(parent instanceof AST_Assign && parent.left === node);
+ && !(parent instanceof AST_Assign && parent.operator == "=" && parent.left === node);
}
function in_conditional(node, parent) {
diff --git a/test/compress/collapse_vars.js b/test/compress/collapse_vars.js
index a5975279..c3832d43 100644
--- a/test/compress/collapse_vars.js
+++ b/test/compress/collapse_vars.js
@@ -7464,3 +7464,30 @@ issue_3651: {
}
expect_stdout: "PASS"
}
+
+issue_3671: {
+ options = {
+ collapse_vars: true,
+ }
+ input: {
+ var a = 0;
+ try {
+ a++;
+ A += 0;
+ a = 1 + a;
+ } catch (e) {
+ console.log(a);
+ }
+ }
+ expect: {
+ var a = 0;
+ try {
+ a++;
+ A += 0;
+ a = 1 + a;
+ } catch (e) {
+ console.log(a);
+ }
+ }
+ expect_stdout: "1"
+}