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llvm/flang/test/Semantics/mod-file-rewriter.f90 

! RUN: rm -fr %t && mkdir %t && cd %t
! RUN: %flang_fc1 -fsyntax-only -fdebug-module-writer %s 2>&1 | FileCheck %s --check-prefix CHECK_CHANGED
! RUN: %flang_fc1 -fsyntax-only -fdebug-module-writer %s 2>&1 | FileCheck %s --check-prefix CHECK_UNCHANGED
! RUN: %flang_fc1 -fsyntax-only -fdebug-module-writer %p/Inputs/mod-file-unchanged.f90 2>&1 | FileCheck %s --check-prefix CHECK_UNCHANGED
! RUN: %flang_fc1 -fsyntax-only -fdebug-module-writer %p/Inputs/mod-file-changed.f90 2>&1 | FileCheck %s --check-prefix CHECK_CHANGED

module m
  real :: x(10)
end module m

! CHECK_CHANGED: Processing module {{.*}}.mod: module written
! CHECK_UNCHANGED: Processing module {{.*}}.mod: module unchanged, not writing