fix corner case in booleans (#4246)

fixes #4245

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)) {

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
+}

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"
+}