Daniel Dunbar 1934108270 [lit] Improve logging with file redirection.
- This will cause lit to automatically include the first 1K of data in
   redirected output files when a command fails (previously if the command
   failed, but the main point of the test was, say, a `FileCheck` later on, then
   the log wasn't helpful in showing why the command failed).

llvm-svn: 272021
2016-06-07 16:13:40 +00:00

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# RUN: true
# RUN: echo hi
# RUN: wc missing-file &> %t.out