[gjs: 4/4] Merge branch 'error-prototype-tostring' into 'master'

[Cosimo Cecchi <cosimoc src gnome org>]

commit c5ffc8da2bc1889d14dc717d9ce444be4c37ce91
Merge: dcb26e63 c9ac7c8f
Author: Cosimo Cecchi <cosimo cecchi gmail com>
Date:   Sat Nov 3 21:35:20 2018 +0000

    Merge branch 'error-prototype-tostring' into 'master'
    
    Fix a regression with GError toString()
    
    See merge request GNOME/gjs!252

 gi/boxed.cpp                         | 35 +++++++++------
 gi/gerror.cpp                        | 86 +++++++++++-------------------------
 gi/gerror.h                          |  6 ++-
 installed-tests/js/testExceptions.js | 36 +++++----------
 4 files changed, 63 insertions(+), 100 deletions(-)
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