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https://github.com/rust-lang/rust-clippy
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make sure a < b
and a >= b
are considered equal by SpanlessEq
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parent
25bbde091a
commit
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3 changed files with 35 additions and 2 deletions
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@ -75,7 +75,8 @@ impl<'a, 'tcx: 'a> SpanlessEq<'a, 'tcx> {
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}
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(&ExprBlock(ref l), &ExprBlock(ref r)) => self.eq_block(l, r),
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(&ExprBinary(l_op, ref ll, ref lr), &ExprBinary(r_op, ref rl, ref rr)) => {
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l_op.node == r_op.node && self.eq_expr(ll, rl) && self.eq_expr(lr, rr)
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l_op.node == r_op.node && self.eq_expr(ll, rl) && self.eq_expr(lr, rr) ||
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swap_binop(l_op.node, ll, lr).map_or(false, |(l_op, ll, lr)| l_op == r_op.node && self.eq_expr(ll, rl) && self.eq_expr(lr, rr))
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}
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(&ExprBreak(li), &ExprBreak(ri)) => both(&li, &ri, |l, r| l.node.name.as_str() == r.node.name.as_str()),
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(&ExprBox(ref l), &ExprBox(ref r)) => self.eq_expr(l, r),
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@ -197,6 +198,23 @@ impl<'a, 'tcx: 'a> SpanlessEq<'a, 'tcx> {
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}
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}
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fn swap_binop<'a>(binop: BinOp_, lhs: &'a Expr, rhs: &'a Expr) -> Option<(BinOp_, &'a Expr, &'a Expr)> {
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match binop {
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BiAdd |
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BiMul |
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BiBitXor |
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BiBitAnd |
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BiEq |
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BiNe |
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BiBitOr => Some((binop, rhs, lhs)),
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BiLt => Some((BiGt, rhs, lhs)),
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BiLe => Some((BiGe, rhs, lhs)),
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BiGe => Some((BiLe, rhs, lhs)),
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BiGt => Some((BiLt, rhs, lhs)),
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BiShl | BiShr | BiRem | BiSub | BiDiv | BiAnd | BiOr => None,
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}
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}
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/// Check if the two `Option`s are both `None` or some equal values as per `eq_fn`.
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fn both<X, F>(l: &Option<X>, r: &Option<X>, mut eq_fn: F) -> bool
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where F: FnMut(&X, &X) -> bool
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@ -58,6 +58,9 @@ fn equality_stuff() {
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let _ = a == b && c == 5 && a == b; //~ ERROR this boolean expression can be simplified
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//|~ HELP for further information visit
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//|~ SUGGESTION let _ = c == 5 && a == b;
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let _ = a == b && c == 5 && b == a; //~ ERROR this boolean expression can be simplified
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//|~ HELP for further information visit
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//|~ SUGGESTION let _ = c == 5 && a == b;
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let _ = a < b && a >= b;
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let _ = a > b && a <= b;
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let _ = a > b && a == b;
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@ -3,7 +3,7 @@
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#[deny(eq_op)]
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#[allow(identity_op)]
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#[allow(no_effect)]
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#[allow(no_effect, unused_variables)]
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#[deny(nonminimal_bool)]
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fn main() {
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// simple values and comparisons
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@ -43,6 +43,18 @@ fn main() {
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true || true; //~ERROR equal expressions
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//~|ERROR this boolean expression can be simplified
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let a: u32 = unimplemented!();
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let b: u32 = unimplemented!();
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a == b && b == a; //~ERROR equal expressions
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//~|ERROR this boolean expression can be simplified
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a != b && b != a; //~ERROR equal expressions
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//~|ERROR this boolean expression can be simplified
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a < b && b > a; //~ERROR equal expressions
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//~|ERROR this boolean expression can be simplified
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a <= b && b >= a; //~ERROR equal expressions
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//~|ERROR this boolean expression can be simplified
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let mut a = vec![1];
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a == a; //~ERROR equal expressions
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2*a.len() == 2*a.len(); // ok, functions
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