fbc-tests: add tests/structs/implicit-cast.bas for implicit cast on UDT cast operator

Author: jayrm

tests/structs/implicit-cast.bas

@@ -0,0 +1,32 @@
+#include "fbcunit.bi"
+
+SUITE( fbc_tests.structs.implicit_cast )
+
+	TEST_GROUP( cast_string )
+
+		function p overload( byref z as const wstring ) as string
+			return "wstring"
+		end function
+		
+		function p( byref s as const string ) as string
+			return "string"
+		end function
+
+		type T
+			__ as integer
+			declare operator cast() as string
+		end type
+		operator T.cast() as string
+			return "123"
+		end operator
+
+		TEST( default )
+			dim x as T
+			CU_ASSERT( left( x, 1 ) = "1" )		
+			CU_ASSERT( right( x, 1 ) = "3" )
+			CU_ASSERT( p( x ) = "string" )
+		END_TEST
+
+	END_TEST_GROUP
+	
+END_SUITE