gcc/testsuite/gdc.test/fail_compilation/fail20.d

/*
TEST_OUTPUT:
---
fail_compilation/fail20.d(16): Error: need member function opCmp() for struct FOO to compare
---
*/

// ICE(cod3) DMD0.080

struct FOO{}

void main()
{
    FOO one;
    FOO two;
    if (one < two){} // This should tell me that there
                     // is no opCmp() defined instead 
                     // of crashing.
}