3 files changed, 55 insertions, 33 deletions

diff --git a/lib/compress.js b/lib/compress.js
index a7585a60..1a1b64f9 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2553,9 +2553,6 @@ merge(Compressor.prototype, {
             return this.tail_node().is_string(compressor);
         });
         def(AST_String, return_true);
-        def(AST_Sub, function(compressor) {
-            return this.expression.is_string(compressor) && this.property instanceof AST_Number;
-        });
         def(AST_SymbolRef, function(compressor) {
             var fixed = this.fixed_value();
             if (!fixed) return false;
@@ -2994,7 +2991,8 @@ merge(Compressor.prototype, {
                     val = global_objs[exp.name];
                 } else {
                     val = exp._eval(compressor, cached, depth + 1);
-                    if (!val || val === exp || !HOP(val, key)) return this;
+                    if (!val || val === exp) return this;
+                    if (typeof val == "object" && !HOP(val, key)) return this;
                     if (typeof val == "function") switch (key) {
                       case "name":
                         return val.node.name ? val.node.name.name : "";
diff --git a/test/compress/evaluate.js b/test/compress/evaluate.js
index 89bfe2a8..0ac117fe 100644
--- a/test/compress/evaluate.js
+++ b/test/compress/evaluate.js
@@ -246,7 +246,7 @@ unsafe_constant: {
     }
     expect: {
         console.log(
-            true.a,
+            void 0,
             false.a,
             null.a,
             (void 0).a
@@ -278,7 +278,7 @@ unsafe_object: {
             o + 1,
             2,
             o.b + 1,
-            1..b + 1
+            NaN
         );
     }
     expect_stdout: true
@@ -365,7 +365,7 @@ unsafe_object_repeated: {
             o + 1,
             2,
             o.b + 1,
-            1..b + 1
+            NaN
         );
     }
     expect_stdout: true
@@ -444,8 +444,8 @@ unsafe_integer_key: {
             2,
             2,
             ({0:1})[1] + 1,
-            1[1] + 1,
-            1["1"] + 1
+            NaN,
+            NaN
         );
     }
     expect_stdout: true
@@ -500,8 +500,8 @@ unsafe_float_key: {
             2,
             2,
             ({2.72:1})[3.14] + 1,
-            1[3.14] + 1,
-            1["3.14"] + 1
+            NaN,
+            NaN
         );
     }
     expect_stdout: true
@@ -635,12 +635,12 @@ unsafe_string_bad_index: {
     }
     expect: {
         console.log(
-            "1234".a + 1,
-            "1234"["a"] + 1,
-            "1234"[3.14] + 1
+            NaN,
+            NaN,
+            NaN
         );
     }
-    expect_stdout: true
+    expect_stdout: "NaN NaN NaN"
 }
 
 prototype_function: {
@@ -1730,3 +1730,30 @@ unsafe_string_replace: {
     }
     expect_stdout: "PASS"
 }
+
+issue_3387_1: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        console.log(1 + (2 + "3"[4]));
+    }
+    expect: {
+        console.log(1 + (2 + "3"[4]));
+    }
+    expect_stdout: "NaN"
+}
+
+issue_3387_2: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log(1 + (2 + "3"[4]));
+    }
+    expect: {
+        console.log(NaN);
+    }
+    expect_stdout: "NaN"
+}
diff --git a/test/compress/reduce_vars.js b/test/compress/reduce_vars.js
index 7ad8ab94..1796ecbe 100644
--- a/test/compress/reduce_vars.js
+++ b/test/compress/reduce_vars.js
@@ -192,38 +192,35 @@ unsafe_evaluate: {
         unused: true,
     }
     input: {
-        function f0(){
-            var a = {
-                b:1
-            };
+        function f0() {
+            var a = { b: 1 };
             console.log(a.b + 3);
         }
-
-        function f1(){
+        function f1() {
             var a = {
-                b:{
-                    c:1
-                },
-                d:2
+                b: { c: 1 },
+                d: 2
             };
             console.log(a.b + 3, a.d + 4, a.b.c + 5, a.d.c + 6);
         }
+        f0();
+        f1();
     }
     expect: {
-        function f0(){
+        function f0() {
             console.log(4);
         }
-
-        function f1(){
+        function f1() {
             var a = {
-                b:{
-                    c:1
-                },
-                d:2
+                b: { c: 1 },
+                d: 2
             };
-            console.log(a.b + 3, 6, 6, 2..c + 6);
+            console.log(a.b + 3, 6, 6, NaN);
         }
+        f0();
+        f1();
     }
+    expect_stdout: true
 }
 
 unsafe_evaluate_side_effect_free_1: {