0.6 will be in April
Unbreak 'rustc --help'
auto merge of #5609 : Kimundi/rust/incoming, r=catamorphism
auto merge of #5603 : brson/rust/relnotes, r=brson
Fix warning about unused imports in import lists

Before, if anything in a list was used, the entire list was considered to be
used. This corrects this and also warns on a span of the actual unused import
instead of the entire list.
Removing unused imports