Parser invalid error advancing for postfix type parameters list #KT-30835 Fixed

compiler/psi/src/org/jetbrains/kotlin/parsing/KotlinParsing.java

@@ -1576,10 +1576,10 @@ public class KotlinParsing extends AbstractKotlinParsing {
             PsiBuilder.Marker error = mark();
             parseTypeParameterList(TokenSet.orSet(TokenSet.create(LPAR), valueParametersFollow));
             if (typeParameterListOccurred) {
-                int offset = myBuilder.getCurrentOffset();
+                int finishIndex = myBuilder.rawTokenIndex();
                 error.rollbackTo();
                 error = mark();
-                advance(offset - myBuilder.getCurrentOffset());
+                advance(finishIndex - myBuilder.rawTokenIndex());
                 error.error("Only one type parameter list is allowed for a function");
             }
             else {

compiler/testData/psi/Functions_ERR.txt

@@ -370,7 +370,6 @@ KtFile: Functions_ERR.kt
     PsiErrorElement:Only one type parameter list is allowed for a function
       PsiElement(LT)('<')
       PsiElement(IDENTIFIER)('foo')
+    VALUE_PARAMETER_LIST
       PsiElement(LPAR)('(')
-      PsiElement(RPAR)(')')
+      PsiElement(RPAR)(')')
-    PsiErrorElement:Expecting '('
-      <empty list>

idea/testData/checker/FunctionOnlyOneTypeParametersList.kt

@@ -0,0 +1 @@
+fun <T> foo<error><SOME_TYPE></error> () {}

idea/tests/org/jetbrains/kotlin/checkers/PsiCheckerTestGenerated.java

@@ -126,6 +126,11 @@ public class PsiCheckerTestGenerated extends AbstractPsiCheckerTest {
             runTest("idea/testData/checker/ForRangeConventions.kt");
         }
 
+        @TestMetadata("FunctionOnlyOneTypeParametersList.kt")
+        public void testFunctionOnlyOneTypeParametersList() throws Exception {
+            runTest("idea/testData/checker/FunctionOnlyOneTypeParametersList.kt");
+        }
+
         @TestMetadata("FunctionReturnTypes.kt")
         public void testFunctionReturnTypes() throws Exception {
             runTest("idea/testData/checker/FunctionReturnTypes.kt");