D21585: C++: update for C++20

[jonathan poelen]

jpoelen created this revision.
jpoelen added reviewers: Framework: Syntax Highlighting, dhaumann, cullmann.
jpoelen added projects: Framework: Syntax Highlighting, Kate, Frameworks.
jpoelen requested review of this revision.

REVISION SUMMARY
  - new attributes: assert, ensures and expects
  - new types: char8_t
  - new keywords: consteval, import, module, concept, requires, co_await, co_return, co_yield

REPOSITORY
  R216 Syntax Highlighting

BRANCH
  cpp2a (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D21585

AFFECTED FILES
  autotests/folding/highlight.cpp.fold
  autotests/html/highlight.cpp.html
  autotests/input/highlight.cpp
  autotests/reference/highlight.cpp.ref
  data/syntax/isocpp.xml

To: jpoelen, #framework_syntax_highlighting, dhaumann, cullmann
Cc: kwrite-devel, kde-frameworks-devel, LeGast00n, gennad, bmortimer, domson, michaelh, genethomas, ngraham, bruns, demsking, cullmann, vkrause, sars, dhaumann
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