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1# RUN: echo foo > %t.foo2# RUN: echo bar > %t.bar3 4# Check output pipe.5# RUN: diff %t.foo %t.foo | FileCheck -allow-empty -check-prefix=EMPTY %s6# RUN: diff -u %t.foo %t.bar | FileCheck %s && false || true7 8# Check input pipe.9# RUN: cat %t.foo | diff -u - %t.foo10# RUN: cat %t.foo | diff -u %t.foo -11# RUN: cat %t.bar | diff -u %t.foo - && false || true12# RUN: cat %t.bar | diff -u - %t.foo && false || true13 14# Check output and input pipes at the same time.15# RUN: cat %t.foo | diff - %t.foo | FileCheck -allow-empty -check-prefix=EMPTY %s16# RUN: cat %t.bar | diff -u %t.foo - | FileCheck %s && false || true17 18# Fail so lit will print output.19# RUN: false20 21# CHECK: @@22# CHECK-NEXT: -foo23# CHECK-NEXT: +bar24 25# EMPTY-NOT: {{.}}26