'where' clause in type alias declaration is a syntax error

(type alias parameters can't have bounds)

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

@@ -1195,9 +1195,12 @@ public class KotlinParsing extends AbstractKotlinParsing {
 
         expect(IDENTIFIER, "Type name expected", TokenSet.orSet(TokenSet.create(LT, EQ, SEMICOLON), TOP_LEVEL_DECLARATION_FIRST));
 
-        // TODO drop type constraints parsing
-        if (parseTypeParameterList(TYPE_PARAMETER_GT_RECOVERY_SET)) {
+        parseTypeParameterList(TYPE_PARAMETER_GT_RECOVERY_SET);
+
+        if (at(WHERE_KEYWORD)) {
+            PsiBuilder.Marker error = mark();
             parseTypeConstraints();
+            error.error("Type alias parameters can't have bounds");
         }
 
         expect(EQ, "Expecting '='", TokenSet.orSet(TOP_LEVEL_DECLARATION_FIRST, TokenSet.create(SEMICOLON)));

compiler/testData/diagnostics/tests/typealias/parameterRestrictions.kt

@@ -2,4 +2,6 @@ typealias WithVariance<<!VARIANCE_ON_TYPE_PARAMETER_NOT_ALLOWED!>in<!> X, <!VARI
 typealias WithBounds1<T : <!BOUND_ON_TYPE_ALIAS_PARAMETER_NOT_ALLOWED!>T<!>> = Int
 typealias WithBounds2<X : <!BOUND_ON_TYPE_ALIAS_PARAMETER_NOT_ALLOWED!>Y<!>, Y : <!BOUND_ON_TYPE_ALIAS_PARAMETER_NOT_ALLOWED!>X<!>> = Int
 
+typealias WithBounds3<X> <!SYNTAX!>where <!DEBUG_INFO_MISSING_UNRESOLVED!>X<!> : <!DEBUG_INFO_MISSING_UNRESOLVED!>Any<!><!> = Int
+
 val x: WithVariance<Int, Int> = 0

compiler/testData/diagnostics/tests/typealias/parameterRestrictions.txt

@@ -2,5 +2,6 @@ package
 
 public typealias WithBounds1</*0*/ T : [ERROR : Cyclic upper bounds]>  = kotlin.Int
 public typealias WithBounds2</*0*/ X : [ERROR : Cyclic upper bounds], /*1*/ Y : [ERROR : Cyclic upper bounds]>  = kotlin.Int
+public typealias WithBounds3</*0*/ X>  = kotlin.Int
 public typealias WithVariance</*0*/ in X, /*1*/ out Y>  = kotlin.Int
 public val x: WithVariance<kotlin.Int, kotlin.Int> [= kotlin.Int] = 0