bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

mechanically swap if_let_chain -> if_chain

Browse source
This commit is contained in:
Alex Burka 2017-10-23 15:18:02 -04:00
parent 2771378620
commit 41840ae3c4
42 changed files with 1843 additions and 1750 deletions
Download patch file Download diff file Expand all files Collapse all files

39
clippy_lints/src/zero_div_zero.rs
View file

@ -31,27 +31,28 @@ impl LintPass for Pass {
impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Pass {
fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, expr: &'tcx Expr) {
// check for instances of 0.0/0.0
if_let_chain! {[
let ExprBinary(ref op, ref left, ref right) = expr.node,
let BinOp_::BiDiv = op.node,
if_chain! {
if let ExprBinary(ref op, ref left, ref right) = expr.node;
if let BinOp_::BiDiv = op.node;
// TODO - constant_simple does not fold many operations involving floats.
// That's probably fine for this lint - it's pretty unlikely that someone would
// do something like 0.0/(2.0 - 2.0), but it would be nice to warn on that case too.
let Some(Constant::Float(ref lhs_value, lhs_width)) = constant_simple(cx, left),
let Some(Constant::Float(ref rhs_value, rhs_width)) = constant_simple(cx, right),
Ok(0.0) == lhs_value.parse(),
Ok(0.0) == rhs_value.parse()
], {
// since we're about to suggest a use of std::f32::NaN or std::f64::NaN,
// match the precision of the literals that are given.
let float_type = match (lhs_width, rhs_width) {
(FloatWidth::F64, _)
| (_, FloatWidth::F64) => "f64",
_ => "f32"
};
span_help_and_lint(cx, ZERO_DIVIDED_BY_ZERO, expr.span,
"constant division of 0.0 with 0.0 will always result in NaN",
&format!("Consider using `std::{}::NAN` if you would like a constant representing NaN", float_type));
}}
if let Some(Constant::Float(ref lhs_value, lhs_width)) = constant_simple(cx, left);
if let Some(Constant::Float(ref rhs_value, rhs_width)) = constant_simple(cx, right);
if Ok(0.0) == lhs_value.parse();
if Ok(0.0) == rhs_value.parse();
then {
// since we're about to suggest a use of std::f32::NaN or std::f64::NaN,
// match the precision of the literals that are given.
let float_type = match (lhs_width, rhs_width) {
(FloatWidth::F64, _)
| (_, FloatWidth::F64) => "f64",
_ => "f32"
};
span_help_and_lint(cx, ZERO_DIVIDED_BY_ZERO, expr.span,
"constant division of 0.0 with 0.0 will always result in NaN",
&format!("Consider using `std::{}::NAN` if you would like a constant representing NaN", float_type));
}
}
}
}