[LLVMbugs] [Bug 23782] New: Use clang-format on types error messages

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23782

            Bug ID: 23782
           Summary: Use clang-format on types error messages
           Product: clang
           Version: 3.6
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: schnetter at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Here is a "typical" compiler error message I'm receiving from clang:

{{{
./fun/grid_impl.hpp:84:4: note: candidate template ignored: substitution
failure
      [with D = 2, F = fun::detail::tree_fmapStencilMulti_g<2,
      cxx::detail::funobj_impl<cell_t (*)(const cell_t &, long),
&cell_get_face>
      > &, G = unsigned long &, C = adt::maxarray<adt::dummy, 16>, T =
      adt::tree<adt::nested<std::__1::shared_ptr<adt::dummy>,
      adt::grid<adt::maxarray<adt::dummy, 16>, adt::dummy, 2>, adt::dummy,
      adt::detail::nested_default_policy<adt::dummy> >, cell_t>, Args =
      <cxx::detail::funobj_impl<cell_t (*)(const cell_t &, unsigned long, const
      cell_t &, const cell_t &, const cell_t &, const cell_t &), &cell_rhs>,
      cxx::detail::funobj_impl<cell_t (*)(const cell_t &, long),
&cell_get_face>
      &>, $6 = nullptr, CT = adt::grid<adt::maxarray<adt::dummy, 16>,
      adt::tree<adt::nested<std::__1::shared_ptr<adt::dummy>,
      adt::grid<adt::maxarray<adt::dummy, 16>, adt::dummy, 2>, adt::dummy,
      adt::detail::nested_default_policy<adt::dummy> >, cell_t>, 2>, BC =
      adt::grid<adt::maxarray<adt::dummy, 16>, adt::dummy, 1>]: no type named
      'type' in 'cxx::invoke_of<unsigned long &,
      adt::tree<adt::nested<std::__1::shared_ptr<adt::dummy>,
      adt::grid<adt::maxarray<adt::dummy, 16>, adt::dummy, 2>, adt::dummy,
      adt::detail::nested_default_policy<adt::dummy> >, cell_t>, long>'
}}}

To understand this tapeworm, I have to copy-paste it into an editor, look for
matching single quotes, and then manually format (indent) the text between the
quotes. Here is an idea: Couldn't one use clang-format to automated? The error
message would then look like

{{{
./fun/grid_impl.hpp:84:4: note: candidate template ignored: substitution
failure
      [with:

   D = 2, F = fun::detail::tree_fmapStencilMulti_g<
              2, cxx::detail::funobj_impl<cell_t (*)(const cell_t &, long),
                                          &cell_get_face>> &,
   G = unsigned long &, C = adt::maxarray<adt::dummy, 16>,
   T = adt::tree<
       adt::nested<std::__1::shared_ptr<adt::dummy>,
                   adt::grid<adt::maxarray<adt::dummy, 16>, adt::dummy, 2>,
                   adt::dummy, adt::detail::nested_default_policy<adt::dummy>>,
       cell_t>,
   Args = <cxx::detail::funobj_impl<cell_t (*)(const cell_t &, unsigned long,
                                               const cell_t &, const cell_t &,
                                               const cell_t &, const cell_t &),
                                    &cell_rhs>,
           cxx::detail::funobj_impl<cell_t (*)(const cell_t &, long),
                                    &cell_get_face> &>,
   $6 = nullptr,
   CT = adt::grid<
       adt::maxarray<adt::dummy, 16>,
       adt::tree<adt::nested<
                     std::__1::shared_ptr<adt::dummy>,
                     adt::grid<adt::maxarray<adt::dummy, 16>, adt::dummy, 2>,
                     adt::dummy,
adt::detail::nested_default_policy<adt::dummy>>,
                 cell_t>,
       2>,
   BC = adt::grid<adt::maxarray<adt::dummy, 16>, adt::dummy, 1>

]: no type named 'type' in

   cxx::invoke_of<
       unsigned long &,
       adt::tree<
           adt::nested<std::__1::shared_ptr<adt::dummy>,
                       adt::grid<adt::maxarray<adt::dummy, 16>, adt::dummy, 2>,
                       adt::dummy,
adt::detail::nested_default_policy<adt::dummy>>,
           cell_t>,
       long>
}}}

which is orders of magnitude more readable.

Alternatively, a simple hierarchical output would also be good...

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