Rollup of 5 pull requests#24453

Closed

Manishearth wants to merge 8 commits intorust-lang:masterfrom

Manishearth:rollup

Commits on Apr 14, 2015

disabling a test for bitrig and openbsd
Dave Huseby
committed
Remove Incorrect Link from std::ptr::null Docs
killercup
committed
Remove superfluous `the` from `custom_attribute` feature gate message
fhahn
committed
Fix the span for tuple expressions
Nick Cameron
committed