[llvm-bugs] [Bug 37711] New: Add option to break before trailing return type

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37711

            Bug ID: 37711
           Summary: Add option to break before trailing return type
           Product: clang
           Version: 6.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Formatter
          Assignee: unassignedclangbugs at nondot.org
          Reporter: matthew.woehlke at kitware.com
                CC: djasper at google.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org

I'm having a number of issues trying to get clang-format to behave reasonably
on
https://github.com/Kitware/kwiver/blob/303a11ebb43c020ab8e48b6ef70407b460dba46b/vital/range/defs.h,
using
https://gist.github.com/mwoehlke-kitware/d8ef9466df5096a035059938aef2948d.

For this RFE, specifically, I would like an option to force a break after a the
closing brace of a function's parameter list and a trailing return type
specifier. For example:

  // Current (unwanted)
  static auto end_helper( Range const& range ) -> decltype( end( range ) )

  // Desired
  static auto end_helper( Range const& range )
    -> decltype( end( range ) )

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