Fix `explicit_counter_loop` suggestion#3901

Merged

bors merged 3 commits intorust-lang:masterfrom

rail-rain:issue_1670

Apr 8, 2019

Commits on Mar 23, 2019

Change explicit_counter_loop's message to reflect original variable name
rail-rain
committed
Change explicit_counter_loop's message to add parentheses if necessary
rail-rain
committed

Commits on Mar 27, 2019

use `span_lint_and_sugg` in `explicit_counter_loop`
rail-rain
committed