Generate descriptor for trait constructor. Exception is thrown otherwise...

EA-38416, EA-65189, EA-60850

compiler/testData/psi/TraitConstructor.kt

@@ -0,0 +1,2 @@
+trait TestTrait(val a: Int, var b: String, c: Double)
+trait TestTrait()

compiler/testData/psi/TraitConstructor.txt

@@ -0,0 +1,50 @@
+JetFile: TraitConstructor.kt
+  PACKAGE_DIRECTIVE
+    <empty list>
+  CLASS
+    PsiElement(trait)('trait')
+    PsiWhiteSpace(' ')
+    PsiElement(IDENTIFIER)('TestTrait')
+    VALUE_PARAMETER_LIST
+      PsiElement(LPAR)('(')
+      VALUE_PARAMETER
+        PsiElement(val)('val')
+        PsiWhiteSpace(' ')
+        PsiElement(IDENTIFIER)('a')
+        PsiElement(COLON)(':')
+        PsiWhiteSpace(' ')
+        TYPE_REFERENCE
+          USER_TYPE
+            REFERENCE_EXPRESSION
+              PsiElement(IDENTIFIER)('Int')
+      PsiElement(COMMA)(',')
+      PsiWhiteSpace(' ')
+      VALUE_PARAMETER
+        PsiElement(var)('var')
+        PsiWhiteSpace(' ')
+        PsiElement(IDENTIFIER)('b')
+        PsiElement(COLON)(':')
+        PsiWhiteSpace(' ')
+        TYPE_REFERENCE
+          USER_TYPE
+            REFERENCE_EXPRESSION
+              PsiElement(IDENTIFIER)('String')
+      PsiElement(COMMA)(',')
+      PsiWhiteSpace(' ')
+      VALUE_PARAMETER
+        PsiElement(IDENTIFIER)('c')
+        PsiElement(COLON)(':')
+        PsiWhiteSpace(' ')
+        TYPE_REFERENCE
+          USER_TYPE
+            REFERENCE_EXPRESSION
+              PsiElement(IDENTIFIER)('Double')
+      PsiElement(RPAR)(')')
+  PsiWhiteSpace('\n')
+  CLASS
+    PsiElement(trait)('trait')
+    PsiWhiteSpace(' ')
+    PsiElement(IDENTIFIER)('TestTrait')
+    VALUE_PARAMETER_LIST
+      PsiElement(LPAR)('(')
+      PsiElement(RPAR)(')')