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Fixes for code review comments

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* remove weird infinite loops from compile-tests
* remove call to Option::unwrap
* in the lint message, show while-let loop rewritten as for loop
This commit is contained in:
Florian Hartwig 2015-10-22 23:16:58 +02:00
parent 659e7c1d5e
commit 8626ac1fd4
2 changed files with 28 additions and 19 deletions
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23
src/loops.rs
View file

@ -231,17 +231,26 @@ impl LateLintPass for LoopsPass {
}
}
}
if let ExprMatch(ref expr, ref arms, MatchSource::WhileLetDesugar) = expr.node {
if let ExprMatch(ref match_expr, ref arms, MatchSource::WhileLetDesugar) = expr.node {
let body = &arms[0].body;
let pat = &arms[0].pats[0].node;
if let (&PatEnum(ref path, _), &ExprMethodCall(method_name, _, ref args)) = (pat, &expr.node) {
let iterator_def_id = var_def_id(cx, &args[0]);
if let (&PatEnum(ref path, Some(ref pat_args)),
&ExprMethodCall(method_name, _, ref method_args)) =
(pat, &match_expr.node) {
let iterator_def_id = var_def_id(cx, &method_args[0]);
if let Some(lhs_constructor) = path.segments.last() {
if method_name.node.as_str() == "next" &&
match_trait_method(cx, expr, &["core", "iter", "Iterator"]) &&
path.segments.last().unwrap().identifier.name.as_str() == "Some" &&
match_trait_method(cx, match_expr, &["core", "iter", "Iterator"]) &&
lhs_constructor.identifier.name.as_str() == "Some" &&
!var_used(body, iterator_def_id, cx) {
span_lint(cx, WHILE_LET_ON_ITERATOR, expr.span,
"this loop could be written as a `for` loop");
let iterator = snippet(cx, method_args[0].span, "_");
let loop_var = snippet(cx, pat_args[0].span, "_");
span_help_and_lint(cx, WHILE_LET_ON_ITERATOR, expr.span,
"this loop could be written as a `for` loop",
&format!("try\nfor {} in {} {{...}}",
loop_var,
iterator));
}
}
}
}

20
tests/compile-fail/while_loop.rs
View file

@ -54,20 +54,24 @@ fn main() {
println!("{}", x);
}
while let Option::Some(x) = (1..20).next() { //~ERROR this loop could be written as a `for` loop
let mut iter = 1..20;
while let Option::Some(x) = iter.next() { //~ERROR this loop could be written as a `for` loop
println!("{}", x);
}
while let Some(x) = (1..20).next() { //~ERROR this loop could be written as a `for` loop
let mut iter = 1..20;
while let Some(x) = iter.next() { //~ERROR this loop could be written as a `for` loop
println!("{}", x);
}
while let Some(_) = (1..20).next() {} //~ERROR this loop could be written as a `for` loop
let mut iter = 1..20;
while let Some(_) = iter.next() {} //~ERROR this loop could be written as a `for` loop
while let None = (1..20).next() {} // this is fine (if nonsensical)
let mut iter = 1..20;
while let None = iter.next() {} // this is fine (if nonsensical)
if let Some(x) = (1..20).next() { // also fine
let mut iter = 1..20;
if let Some(x) = iter.next() { // also fine
println!("{}", x)
}
@ -76,10 +80,6 @@ fn main() {
while let Some(x) = iter.next() {
println!("next: {:?}", iter.next())
}
// but this should:
let mut iter2 = 1u32..20;
while let Some(x) = iter2.next() { } //~ERROR this loop could be written as a `for` loop
}
// regression test (#360)