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This commit is contained in:
Michael Wright 2019-07-06 19:35:08 +02:00
parent 0579c3e0aa
commit adcc02ed8a
3 changed files with 21 additions and 12 deletions
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12
clippy_lints/src/loops.rs
View file

@ -488,7 +488,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Loops {
},
NeverLoopResult::MayContinueMainLoop | NeverLoopResult::Otherwise => (),
}
};
}
// check for `loop { if let {} else break }` that could be `while let`
// (also matches an explicit "match" instead of "if let")
@ -587,17 +587,9 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Loops {
}
}
if_chain! {
if let ExprKind::Loop(block, _, LoopSource::While) = &expr.node;
if let Block { expr: Some(expr), .. } = &**block;
if let ExprKind::Match(cond, arms, MatchSource::WhileDesugar) = &expr.node;
if let ExprKind::DropTemps(cond) = &cond.node;
if let [arm, ..] = &arms[..];
if let Arm { body, .. } = arm;
then {
if let Some((cond, body)) = higher::while_loop(&expr) {
check_infinite_loop(cx, cond, body);
}
}
check_needless_collect(expr, cx);
}

2
clippy_lints/src/utils/author.rs
View file

@ -702,7 +702,7 @@ fn loop_desugaring_name(des: hir::LoopSource) -> &'static str {
match des {
hir::LoopSource::ForLoop => "LoopSource::ForLoop",
hir::LoopSource::Loop => "LoopSource::Loop",
hir::LoopSource::While => "LoopSource::WhileDesugar",
hir::LoopSource::While => "LoopSource::While",
hir::LoopSource::WhileLet => "LoopSource::WhileLet",
}
}

17
clippy_lints/src/utils/higher.rs
View file

@ -199,6 +199,23 @@ pub fn for_loop(expr: &hir::Expr) -> Option<(&hir::Pat, &hir::Expr, &hir::Expr)>
None
}
/// Recover the essential nodes of a desugared while loop:
/// `while cond { body }` becomes `(cond, body)`.
pub fn while_loop(expr: &hir::Expr) -> Option<(&hir::Expr, &hir::Expr)> {
if_chain! {
if let hir::ExprKind::Loop(block, _, hir::LoopSource::While) = &expr.node;
if let hir::Block { expr: Some(expr), .. } = &**block;
if let hir::ExprKind::Match(cond, arms, hir::MatchSource::WhileDesugar) = &expr.node;
if let hir::ExprKind::DropTemps(cond) = &cond.node;
if let [arm, ..] = &arms[..];
if let hir::Arm { body, .. } = arm;
then {
return Some((cond, body));
}
}
None
}
/// Recover the essential nodes of a desugared if block
/// `if cond { then } else { els }` becomes `(cond, then, Some(els))`
pub fn if_block(expr: &hir::Expr) -> Option<(&hir::Expr, &hir::Expr, Option<&hir::Expr>)> {