diff options
| -rw-r--r-- | clippy_lints/src/loops.rs | 50 | ||||
| -rw-r--r-- | tests/ui/manual_memcpy.rs | 5 | ||||
| -rw-r--r-- | tests/ui/manual_memcpy.stderr | 2 |
3 files changed, 29 insertions, 28 deletions
diff --git a/clippy_lints/src/loops.rs b/clippy_lints/src/loops.rs index 6b5a8498dc9..ca61c97e3e3 100644 --- a/clippy_lints/src/loops.rs +++ b/clippy_lints/src/loops.rs @@ -951,7 +951,7 @@ fn detect_manual_memcpy<'a, 'tcx>( ) { if let Some(higher::Range { start: Some(start), - ref end, + end: Some(end), limits, }) = higher::range(cx, arg) { @@ -990,35 +990,31 @@ fn detect_manual_memcpy<'a, 'tcx>( } }; - let print_limit = |end: &Option<&Expr<'_>>, offset: Offset, var_name: &str| { - if let Some(end) = *end { - if_chain! { - if let ExprKind::MethodCall(ref method, _, ref len_args) = end.kind; - if method.ident.name == sym!(len); - if len_args.len() == 1; - if let Some(arg) = len_args.get(0); - if snippet(cx, arg.span, "??") == var_name; - then { - return if offset.negate { - format!("({} - {})", snippet(cx, end.span, "<src>.len()"), offset.value) - } else { - String::new() - }; - } + let print_limit = |end: &Expr<'_>, offset: Offset, var_name: &str| { + if_chain! { + if let ExprKind::MethodCall(ref method, _, ref len_args) = end.kind; + if method.ident.name == sym!(len); + if len_args.len() == 1; + if let Some(arg) = len_args.get(0); + if snippet(cx, arg.span, "??") == var_name; + then { + return if offset.negate { + format!("({} - {})", snippet(cx, end.span, "<src>.len()"), offset.value) + } else { + String::new() + }; } + } - let end_str = match limits { - ast::RangeLimits::Closed => { - let end = sugg::Sugg::hir(cx, end, "<count>"); - format!("{}", end + sugg::ONE) - }, - ast::RangeLimits::HalfOpen => format!("{}", snippet(cx, end.span, "..")), - }; + let end_str = match limits { + ast::RangeLimits::Closed => { + let end = sugg::Sugg::hir(cx, end, "<count>"); + format!("{}", end + sugg::ONE) + }, + ast::RangeLimits::HalfOpen => format!("{}", snippet(cx, end.span, "..")), + }; - print_sum(&Offset::positive(end_str), &offset) - } else { - "..".into() - } + print_sum(&Offset::positive(end_str), &offset) }; // The only statements in the for loops can be indexed assignments from diff --git a/tests/ui/manual_memcpy.rs b/tests/ui/manual_memcpy.rs index aa347288875..1f41838fa16 100644 --- a/tests/ui/manual_memcpy.rs +++ b/tests/ui/manual_memcpy.rs @@ -98,6 +98,11 @@ pub fn manual_copy(src: &[i32], dst: &mut [i32], dst2: &mut [i32]) { for i in from..from + 3 { dst[i] = src[i - from]; } + + // `RangeTo` `for` loop - don't trigger lint + for i in 0.. { + dst[i] = src[i]; + } } #[warn(clippy::needless_range_loop, clippy::manual_memcpy)] diff --git a/tests/ui/manual_memcpy.stderr b/tests/ui/manual_memcpy.stderr index ec80f6070d6..95114c46f36 100644 --- a/tests/ui/manual_memcpy.stderr +++ b/tests/ui/manual_memcpy.stderr @@ -67,7 +67,7 @@ LL | for i in from..from + 3 { | ^^^^^^^^^^^^^^ help: try replacing the loop by: `dst[from..from + 3].clone_from_slice(&src[..(from + 3 - from)])` error: it looks like you're manually copying between slices - --> $DIR/manual_memcpy.rs:105:14 + --> $DIR/manual_memcpy.rs:110:14 | LL | for i in 0..src.len() { | ^^^^^^^^^^^^ help: try replacing the loop by: `dst[..src.len()].clone_from_slice(&src[..])` |