fix corner case in `booleans` (#4246)

fixes #4245

3 files changed, 44 insertions, 1 deletions

diff --git a/test/compress.js b/test/compress.js
index 77b09f0d..3d9b1a63 100644
--- a/test/compress.js
+++ b/test/compress.js
@@ -386,7 +386,7 @@ function test_case(test) {
             mangle: test.mangle
         });
         var actual = stdout[toplevel ? 1 : 0];
-        if (test.expect_stdout === true) {
+        if (test.expect_stdout === true || test.expect_stdout instanceof Error && test.expect_stdout.name === actual.name) {
             test.expect_stdout = actual;
         }
         if (!sandbox.same_stdout(test.expect_stdout, actual)) {
diff --git a/test/compress/const.js b/test/compress/const.js
index 694c9d16..2f88975e 100644
--- a/test/compress/const.js
+++ b/test/compress/const.js
@@ -1084,3 +1084,23 @@ issue_4231: {
     }
     expect_stdout: "function"
 }
+
+issue_4245: {
+    options = {
+        booleans: true,
+    }
+    input: {
+        const a = f();
+        function f() {
+            typeof a;
+        }
+    }
+    expect: {
+        const a = f();
+        function f() {
+            a,
+            1;
+        }
+    }
+    expect_stdout: true
+}
diff --git a/test/compress/let.js b/test/compress/let.js
index 8374db9a..deb48120 100644
--- a/test/compress/let.js
+++ b/test/compress/let.js
@@ -893,3 +893,26 @@ issue_4231: {
     expect_stdout: "function"
     node_version: ">=4"
 }
+
+issue_4245: {
+    options = {
+        booleans: true,
+    }
+    input: {
+        "use strict";
+        let a = f();
+        function f() {
+            typeof a;
+        }
+    }
+    expect: {
+        "use strict";
+        let a = f();
+        function f() {
+            a,
+            1;
+        }
+    }
+    expect_stdout: ReferenceError("a is not defined")
+    node_version: ">=4"
+}