[llvm-bugs] [Bug 44345] New: Long namespace closing comment is duplicated endlessly

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44345

            Bug ID: 44345
           Summary: Long namespace closing comment is duplicated endlessly
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Formatter
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ipherian at gmail.com
                CC: djasper at google.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org

Created attachment 22950
  --> https://bugs.llvm.org/attachment.cgi?id=22950&action=edit
gif of the bug happening

For long namespace declarations, clang-format adds the comment at the close of
the namespace endlessly.

this code:


namespace
would::it::save::you::a::lot::of::time::if_::i::just::gave::up::and_::went::mad::now
{
        void foo();
        void bar();
}


gets turned into this, after a few formats:


namespace
would::it::save::you::a::lot::of::time::if_::i::just::gave::up::and_::
    went::mad::now {
void foo();
void bar();
} // namespace
  //
would::it::save::you::a::lot::of::time::if_::i::just::gave::up::and_::went::mad::now
  //
would::it::save::you::a::lot::of::time::if_::i::just::gave::up::and_::went::mad::now
  //
would::it::save::you::a::lot::of::time::if_::i::just::gave::up::and_::went::mad::now


...and it repeats forever.


details:

- using version 10.0.0-e20a1e486e1 
https://github.com/llvm/llvm-project/commit/e20a1e486e1
- no special switches were added to clang-format, no .clang-format file present
- also occurs on 9.0.0 build for windows

expected behavior:

- only adds the end of namespace comment once

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