[llvm-bugs] [Bug 44237] New: cleanupAroundReplacements should insert #include directives after #pragma once

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44237

            Bug ID: 44237
           Summary: cleanupAroundReplacements should insert #include
                    directives after #pragma once
           Product: clang
           Version: 8.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Formatter
          Assignee: unassignedclangbugs at nondot.org
          Reporter: igor.bronstein at gmail.com
                CC: djasper at google.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org

Our tool uses clang::format::cleanupAroundReplacements() to insert #include
directives to generated replacements. I can see the following inconsistent
logic: if we try insert #include directives to a header file with a header
guard (#ifndef #define), the directive will be correctly inserted after the
guard. However this logic doesn't apply to #pragma once. The #include
directives will be inserted before the #pragma. This looks wrong for us.

#pragma once should be treated as a header guard in this usecase.

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