This fixes a couple of errors in the printers for chrono types, and adds
tests to ensure they keep working.
libstdc++-v3/ChangeLog:
* python/libstdcxx/v6/printers.py (StdChronoDurationPrinter):
Print floating-point durations correctly.
(StdChronoTimePointPrinter): Support printing only the value,
not the type name. Uncomment handling for known clocks.
(StdChronoZonedTimePrinter): Remove type names from output.
(StdChronoCalendarPrinter): Fix hh_mm_ss member access.
(StdChronoTimeZonePrinter): Add equals sign to output.
* testsuite/libstdc++-prettyprinters/chrono.cc: New test.
(cherry picked from commit 7bd251ca751317385f7e2e4e031736a99f376012)
Jonathan Wakely
b05b8c9a1f