tests/hard_coded/Mmakefile:
Filter the output for the above test to remove C# (Mono) and
Java stack traces. Because of the way initialisers are (currently)
implemented for those backends using MERCURY_SUPPRESS_STACK_TRACE
would not work (even if the respective runtimes supported it).
tests/hard_coded/init_excp.exp2:
Expected output for the Java grades.
tests/hard_coded/init_excp.exp3:
Expected output for the C# grades.
