Added failing double-word lowering test.
Added test that triggers an exchange with the same node.
Added test that results in an output mismatch.
Added test that crashes during jump threading.
Added test that triggers assertion during chordal coloring.
Test should fail due to missing curly braces.
fix vim external build script on x86_64 computers
bug: stringifying of unknown chars is reported as an error
test that the -ansi commandline switch does not crash cparser