[leorize]

Yes, we use valgrind for the compiler and stdlib test suite. The testament tool supports this, however it's not in widespread use outside of the compiler and stdlib, so documentation is rather sparse.

Since Nim uses the C compiler to generate executables, you should be able to use `--passC:-fsanitize=memory --passL:-fsanitize=memory` to enable msan. For maximum effectiveness the flags `-d:useMalloc --gc:orc` should also be used.

`-d:useMalloc` tells Nim to allocate memory using libc's malloc instead of our TSLF implementation. This should provide adequate compatibility for use with external inspection tools. We do

`--gc:orc` because this is one of the only GCs that support -d:useMalloc (the other being arc).

[scns]

Please put this in the docs, if it is not there already