While Rust uses 4 spaces for indentation, we should use tabs in theI find it weird to mix indentations in one file, but if it leaves a
generated C code. This does result in some scary-looking tab characters
in a .rs file, but they're in a string literal, so shouldn't make
anything complain too much.
Fixes: a66d733da801 ("rust: support running Rust documentation tests as KUnit ones")
Signed-off-by: David Gow <davidgow@xxxxxxxxxx>
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