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Fix suggestions for REVERSE_RANGE_LOOP

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mcarton 2016-06-09 23:05:48 +02:00
parent 3ae39145fc
commit e9360f7675
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2 changed files with 10 additions and 2 deletions
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10
clippy_lints/src/loops.rs
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@ -444,6 +444,11 @@ fn check_for_loop_reverse_range(cx: &LateContext, arg: &Expr, expr: &Expr) {
if sup {
let start_snippet = snippet(cx, start.span, "_");
let end_snippet = snippet(cx, end.span, "_");
let dots = if limits == ast::RangeLimits::Closed {
"..."
} else {
".."
};
span_lint_and_then(cx,
REVERSE_RANGE_LOOP,
@ -454,7 +459,10 @@ fn check_for_loop_reverse_range(cx: &LateContext, arg: &Expr, expr: &Expr) {
"consider using the following if \
you are attempting to iterate \
over this range in reverse",
format!("({}..{}).rev()", end_snippet, start_snippet));
format!("({end}{dots}{start}).rev()",
end=end_snippet,
dots=dots,
start=start_snippet));
});
} else if eq && limits != ast::RangeLimits::Closed {
// if they are equal, it's also problematic - this loop

2
tests/compile-fail/for_loop.rs
View file

@ -169,7 +169,7 @@ fn main() {
for i in 10...0 {
//~^ERROR this range is empty so this for loop will never run
//~|HELP consider
//~|SUGGESTION (0..10).rev()
//~|SUGGESTION (0...10).rev()
println!("{}", i);
}