Fix JS parser to properly handle "." <keyword> sequence

js/js.parser/src/com/google/gwt/dev/js/rhino/Parser.java

@@ -995,8 +995,9 @@ public class Parser extends Observable {
     int tt;
     while ((tt = ts.getToken()) > ts.EOF) {
       if (tt == ts.DOT) {
+        ts.treatKeywordAsIdentifier = true;
         mustMatchToken(ts, ts.NAME, "msg.no.name.after.dot");
-        String s = ts.getString();
+        ts.treatKeywordAsIdentifier = false;
         pn = nf.createBinary(ts.DOT, pn, nf.createName(ts.getString()));
         /*
          * pn = nf.createBinary(ts.DOT, pn, memberExpr(ts)) is the version in

js/js.parser/src/com/google/gwt/dev/js/rhino/TokenStream.java

@@ -695,7 +695,7 @@ public class TokenStream {
             in.unread();
 
                String str = getStringFromBuffer();
-            if (!containsEscape) {
+            if (!containsEscape && !treatKeywordAsIdentifier) {
                 // OPT we shouldn't have to make a string (object!) to
                 // check if it's a keyword.
 
@@ -1477,6 +1477,7 @@ public class TokenStream {
     CodePosition lastPosition;
 
     private int op;
+    public boolean treatKeywordAsIdentifier;
 
     // Set this to an inital non-null value so that the Parser has
     // something to retrieve even if an error has occured and no

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java

@@ -4664,6 +4664,12 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             doTest(fileName);
         }
 
+        @TestMetadata("keywordAsMemberName.kt")
+        public void testKeywordAsMemberName() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/inlineMultiModule/keywordAsMemberName.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("kt16144.kt")
         public void testKt16144() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/inlineMultiModule/kt16144.kt");

js/js.translator/testData/box/inlineMultiModule/keywordAsMemberName.kt

@@ -0,0 +1,13 @@
+// MINIFICATION_THRESHOLD: 481
+// MODULE: lib
+// FILE: lib.kt
+class A {
+    fun instanceof() = "OK"
+}
+
+inline fun foo() = A().instanceof()
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+fun box() = foo()