diff options
| -rw-r--r-- | clippy_lints/src/len_zero.rs | 22 | ||||
| -rw-r--r-- | tests/ui/len_zero.fixed | 4 | ||||
| -rw-r--r-- | tests/ui/len_zero.rs | 4 | ||||
| -rw-r--r-- | tests/ui/len_zero.stderr | 16 |
4 files changed, 34 insertions, 12 deletions
diff --git a/clippy_lints/src/len_zero.rs b/clippy_lints/src/len_zero.rs index 0805b4b1979..fec9c6f626c 100644 --- a/clippy_lints/src/len_zero.rs +++ b/clippy_lints/src/len_zero.rs @@ -168,25 +168,27 @@ impl<'tcx> LateLintPass<'tcx> for LenZero { } if let ExprKind::Binary(Spanned { node: cmp, .. }, left, right) = expr.kind { + // expr.span might contains parenthesis, see issue #10529 + let actual_span = left.span.with_hi(right.span.hi()); match cmp { BinOpKind::Eq => { - check_cmp(cx, expr.span, left, right, "", 0); // len == 0 - check_cmp(cx, expr.span, right, left, "", 0); // 0 == len + check_cmp(cx, actual_span, left, right, "", 0); // len == 0 + check_cmp(cx, actual_span, right, left, "", 0); // 0 == len }, BinOpKind::Ne => { - check_cmp(cx, expr.span, left, right, "!", 0); // len != 0 - check_cmp(cx, expr.span, right, left, "!", 0); // 0 != len + check_cmp(cx, actual_span, left, right, "!", 0); // len != 0 + check_cmp(cx, actual_span, right, left, "!", 0); // 0 != len }, BinOpKind::Gt => { - check_cmp(cx, expr.span, left, right, "!", 0); // len > 0 - check_cmp(cx, expr.span, right, left, "", 1); // 1 > len + check_cmp(cx, actual_span, left, right, "!", 0); // len > 0 + check_cmp(cx, actual_span, right, left, "", 1); // 1 > len }, BinOpKind::Lt => { - check_cmp(cx, expr.span, left, right, "", 1); // len < 1 - check_cmp(cx, expr.span, right, left, "!", 0); // 0 < len + check_cmp(cx, actual_span, left, right, "", 1); // len < 1 + check_cmp(cx, actual_span, right, left, "!", 0); // 0 < len }, - BinOpKind::Ge => check_cmp(cx, expr.span, left, right, "!", 1), // len >= 1 - BinOpKind::Le => check_cmp(cx, expr.span, right, left, "!", 1), // 1 <= len + BinOpKind::Ge => check_cmp(cx, actual_span, left, right, "!", 1), // len >= 1 + BinOpKind::Le => check_cmp(cx, actual_span, right, left, "!", 1), // 1 <= len _ => (), } } diff --git a/tests/ui/len_zero.fixed b/tests/ui/len_zero.fixed index 34b2021df45..2c22abd7e4b 100644 --- a/tests/ui/len_zero.fixed +++ b/tests/ui/len_zero.fixed @@ -176,6 +176,10 @@ fn main() { // No error; `HasWrongIsEmpty` does not have `.is_empty()`. println!("Or this!"); } + + // issue #10529 + (!has_is_empty.is_empty()).then(|| println!("This can happen.")); + (has_is_empty.is_empty()).then(|| println!("Or this!")); } fn test_slice(b: &[u8]) { diff --git a/tests/ui/len_zero.rs b/tests/ui/len_zero.rs index c83ae2ac553..a011ff97644 100644 --- a/tests/ui/len_zero.rs +++ b/tests/ui/len_zero.rs @@ -176,6 +176,10 @@ fn main() { // No error; `HasWrongIsEmpty` does not have `.is_empty()`. println!("Or this!"); } + + // issue #10529 + (has_is_empty.len() > 0).then(|| println!("This can happen.")); + (has_is_empty.len() == 0).then(|| println!("Or this!")); } fn test_slice(b: &[u8]) { diff --git a/tests/ui/len_zero.stderr b/tests/ui/len_zero.stderr index b6f13780253..396cfb75fb6 100644 --- a/tests/ui/len_zero.stderr +++ b/tests/ui/len_zero.stderr @@ -123,10 +123,22 @@ LL | if with_is_empty.len() == 0 { | ^^^^^^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `with_is_empty.is_empty()` error: length comparison to zero - --> $DIR/len_zero.rs:182:8 + --> $DIR/len_zero.rs:181:6 + | +LL | (has_is_empty.len() > 0).then(|| println!("This can happen.")); + | ^^^^^^^^^^^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!has_is_empty.is_empty()` + +error: length comparison to zero + --> $DIR/len_zero.rs:182:6 + | +LL | (has_is_empty.len() == 0).then(|| println!("Or this!")); + | ^^^^^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `has_is_empty.is_empty()` + +error: length comparison to zero + --> $DIR/len_zero.rs:186:8 | LL | if b.len() != 0 {} | ^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!b.is_empty()` -error: aborting due to 21 previous errors +error: aborting due to 23 previous errors |