handle computed properties correctly

lib/compress.js

@@ -4907,7 +4907,12 @@ merge(Compressor.prototype, {
                         expression: make_node(AST_Array, expr, {
                             elements: props.map(function(prop) {
                                 var v = prop.value;
-                                return v instanceof AST_Accessor ? make_node(AST_Function, v, v) : v;
+                                if (v instanceof AST_Accessor) v = make_node(AST_Function, v, v);
+                                var k = prop.key;
+                                if (k instanceof AST_Node && !(k instanceof AST_SymbolMethod)) {
+                                    return make_sequence(prop, [ k, v ]);
+                                }
+                                return v;
                             })
                         }),
                         property: make_node(AST_Number, this, {

test/compress/properties.js

@@ -1258,3 +1258,27 @@ array_hole: {
     }
     expect_stdout: "2 undefined 3"
 }
+
+computed_property: {
+    options = {
+        properties: true,
+        side_effects: true,
+    }
+    input: {
+        console.log({
+            a: "bar",
+            [console.log("foo")]: 42,
+        }.a);
+    }
+    expect: {
+        console.log([
+            "bar",
+            console.log("foo")
+        ][0]);
+    }
+    expect_stdout: [
+        "foo",
+        "bar"
+    ]
+    node_version: ">=4"
+}