[llvm-bugs] [Bug 43531] New: clang-format damages "alternative representations" for operators

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43531

            Bug ID: 43531
           Summary: clang-format damages "alternative representations" for
                    operators
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Formatter
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sfinae at hotmail.com
                CC: djasper at google.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org

compl 5 means ~5. When clang-format sees this, it's so eager to smash away the
space, that it emits compl5 which damages the code.

C:\Temp>type woof.cpp
#include <ciso646>
#include <cstdio>

int main()
{
    unsigned int x = 7;
    x &= ~5;
    printf("Should be 2: %u\n", x);

    unsigned int y = 7;
    y and_eq compl 5;
    printf("Should be 2: %u\n", y);
}

C:\Temp>cl /EHsc /nologo /W4 woof.cpp && woof
woof.cpp
Should be 2: 2
Should be 2: 2

C:\Temp>clang-cl -m64 /EHsc /nologo /W4 woof.cpp && woof
Should be 2: 2
Should be 2: 2

C:\Temp>clang-format -i woof.cpp

C:\Temp>type woof.cpp
#include <ciso646>
#include <cstdio>

int main() {
  unsigned int x = 7;
  x &= ~5;
  printf("Should be 2: %u\n", x);

  unsigned int y = 7;
  y and_eq compl5;
  printf("Should be 2: %u\n", y);
}

C:\Temp>cl /EHsc /nologo /W4 woof.cpp && woof
woof.cpp
woof.cpp(10): error C2065: 'compl5': undeclared identifier

C:\Temp>clang-cl -m64 /EHsc /nologo /W4 woof.cpp && woof
woof.cpp(10,12): error: use of undeclared identifier 'compl5'
  y and_eq compl5;
           ^
1 error generated.

C:\Temp>clang-format -version
clang-format version 8.0.1 (tags/RELEASE_801/final)

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