lit 0.4.0

Integrated testing tool, inspired by LLVM's 'lit' testing script
Documentation
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; RUN: echo "hello world once" > @first_tempfile && cat @first_tempfile
; RUN: echo "hello world twice" > @second_tempfile && cat @second_tempfile
; RUN: echo "hello world thrice" > @tempfiles_for_days && cat @tempfiles_for_days

; CHECK: hello world