[Bug libstdc++/53578] include/ext/concurrence.h relies on ill-formed narrowing conversions

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53578

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-06-15 
00:28:36 UTC ---
Should be fixed on trunk, please test.