handle function/variable name collisions correctly (#3451)

fixes #3439

2 files changed, 61 insertions, 0 deletions

diff --git a/test/compress/collapse_vars.js b/test/compress/collapse_vars.js
index 17835a89..090f3cf8 100644
--- a/test/compress/collapse_vars.js
+++ b/test/compress/collapse_vars.js
@@ -6197,3 +6197,43 @@ Infinity_assignment: {
     }
     expect_stdout: true
 }
+
+issue_3439_1: {
+    options = {
+        collapse_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(typeof function(a) {
+            function a() {}
+            return a;
+        }(42));
+    }
+    expect: {
+        console.log(typeof function(a) {
+            function a() {}
+            return a;
+        }(42));
+    }
+    expect_stdout: "function"
+}
+
+issue_3439_2: {
+    options = {
+        collapse_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(typeof function() {
+            var a = 42;
+            function a() {}
+            return a;
+        }());
+    }
+    expect: {
+        console.log(typeof function() {
+            return 42;
+        }());
+    }
+    expect_stdout: "number"
+}
diff --git a/test/compress/functions.js b/test/compress/functions.js
index 40a38c02..f01a02e8 100644
--- a/test/compress/functions.js
+++ b/test/compress/functions.js
@@ -3149,6 +3149,27 @@ issue_3402: {
     ]
 }
 
+issue_3439: {
+    options = {
+        inline: true,
+    }
+    input: {
+        console.log(typeof function() {
+            return function(a) {
+                function a() {}
+                return a;
+            }(42);
+        }());
+    }
+    expect: {
+        console.log(typeof function(a) {
+            function a() {}
+            return a;
+        }(42));
+    }
+    expect_stdout: "function"
+}
+
 issue_3444: {
     options = {
         inline: true,