Fix FunctionLiteral grammar (#3887)

Author: Bolpat

spec/expression.dd

@@ -2274,12 +2274,15 @@ $(H3 $(LNAME2 function_literals, Function Literals))
 
 $(GRAMMAR
 $(GNAME FunctionLiteral):
-    $(D function) $(GLINK RefOrAutoRef)$(OPT) $(GLINK2 type, Type)$(OPT) $(GLINK ParameterWithAttributes)$(OPT) $(GLINK FunctionLiteralBody)
-    $(D delegate) $(GLINK RefOrAutoRef)$(OPT) $(GLINK2 type, Type)$(OPT) $(GLINK ParameterWithMemberAttributes)$(OPT) $(GLINK FunctionLiteralBody)
+    $(D function) $(GLINK RefOrAutoRef)$(OPT) $(GLINK BasicTypeWithSuffixes)$(OPT) $(GLINK ParameterWithAttributes)$(OPT) $(GLINK FunctionLiteralBody)
+    $(D delegate) $(GLINK RefOrAutoRef)$(OPT) $(GLINK BasicTypeWithSuffixes)$(OPT) $(GLINK ParameterWithMemberAttributes)$(OPT) $(GLINK FunctionLiteralBody)
     $(GLINK RefOrAutoRef)$(OPT) $(GLINK ParameterWithMemberAttributes) $(GLINK FunctionLiteralBody)
     $(GLINK2 statement, BlockStatement)
     $(IDENTIFIER) $(D =>) $(GLINK AssignExpression)
 
+$(GNAME BasicTypeWithSuffixes):
+    $(GLINK2 type, BasicType) $(GLINK2 type, TypeSuffixes)$(OPT)
+
 $(GNAME ParameterWithAttributes):
     $(GLINK2 function, Parameters) $(GLINK2 function, FunctionAttributes)$(OPT)