use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet_with_applicability;
-use clippy_utils::{meets_msrv, SpanlessEq};
+use clippy_utils::{meets_msrv, msrvs, SpanlessEq};
use if_chain::if_chain;
use rustc_ast::ast::LitKind;
use rustc_errors::Applicability;
use rustc_semver::RustcVersion;
use rustc_session::{declare_tool_lint, impl_lint_pass};
-const CHECKED_CONVERSIONS_MSRV: RustcVersion = RustcVersion::new(1, 34, 0);
-
declare_clippy_lint! {
- /// **What it does:** Checks for explicit bounds checking when casting.
- ///
- /// **Why is this bad?** Reduces the readability of statements & is error prone.
+ /// ### What it does
+ /// Checks for explicit bounds checking when casting.
///
- /// **Known problems:** None.
+ /// ### Why is this bad?
+ /// Reduces the readability of statements & is error prone.
///
- /// **Example:**
+ /// ### Example
/// ```rust
/// # let foo: u32 = 5;
/// # let _ =
/// i32::try_from(foo).is_ok()
/// # ;
/// ```
+ #[clippy::version = "1.37.0"]
pub CHECKED_CONVERSIONS,
pedantic,
"`try_from` could replace manual bounds checking when casting"
impl<'tcx> LateLintPass<'tcx> for CheckedConversions {
fn check_expr(&mut self, cx: &LateContext<'_>, item: &Expr<'_>) {
- if !meets_msrv(self.msrv.as_ref(), &CHECKED_CONVERSIONS_MSRV) {
+ if !meets_msrv(self.msrv.as_ref(), &msrvs::TRY_FROM) {
return;
}
let result = if_chain! {
if !in_external_macro(cx.sess(), item.span);
- if let ExprKind::Binary(op, ref left, ref right) = &item.kind;
+ if let ExprKind::Binary(op, left, right) = &item.kind;
then {
match op.node {
/// Check for `expr <= (to_type::MAX as from_type)`
fn check_upper_bound<'tcx>(expr: &'tcx Expr<'tcx>) -> Option<Conversion<'tcx>> {
if_chain! {
- if let ExprKind::Binary(ref op, ref left, ref right) = &expr.kind;
+ if let ExprKind::Binary(ref op, left, right) = &expr.kind;
if let Some((candidate, check)) = normalize_le_ge(op, left, right);
if let Some((from, to)) = get_types_from_cast(check, INTS, "max_value", "MAX");
}
// First of we need a binary containing the expression & the cast
- if let ExprKind::Binary(ref op, ref left, ref right) = &expr.kind {
+ if let ExprKind::Binary(ref op, left, right) = &expr.kind {
normalize_le_ge(op, right, left).and_then(|(l, r)| check_function(l, r))
} else {
None
// or `to_type::MAX as from_type`
let call_from_cast: Option<(&Expr<'_>, &str)> = if_chain! {
// to_type::max_value(), from_type
- if let ExprKind::Cast(ref limit, ref from_type) = &expr.kind;
+ if let ExprKind::Cast(limit, from_type) = &expr.kind;
if let TyKind::Path(ref from_type_path) = &from_type.kind;
if let Some(from_sym) = int_ty_to_sym(from_type_path);
let limit_from: Option<(&Expr<'_>, &str)> = call_from_cast.or_else(|| {
if_chain! {
// `from_type::from, to_type::max_value()`
- if let ExprKind::Call(ref from_func, ref args) = &expr.kind;
+ if let ExprKind::Call(from_func, args) = &expr.kind;
// `to_type::max_value()`
if args.len() == 1;
if let limit = &args[0];
/// Gets the type which implements the called function
fn get_implementing_type<'a>(path: &QPath<'_>, candidates: &'a [&str], function: &str) -> Option<&'a str> {
if_chain! {
- if let QPath::TypeRelative(ref ty, ref path) = &path;
+ if let QPath::TypeRelative(ty, path) = &path;
if path.ident.name.as_str() == function;
- if let TyKind::Path(QPath::Resolved(None, ref tp)) = &ty.kind;
+ if let TyKind::Path(QPath::Resolved(None, tp)) = &ty.kind;
if let [int] = &*tp.segments;
then {
- let name = &int.ident.name.as_str();
- candidates.iter().find(|c| name == *c).cloned()
+ let name = int.ident.name.as_str();
+ candidates.iter().find(|c| &name == *c).copied()
} else {
None
}
/// Gets the type as a string, if it is a supported integer
fn int_ty_to_sym<'tcx>(path: &QPath<'_>) -> Option<&'tcx str> {
if_chain! {
- if let QPath::Resolved(_, ref path) = *path;
+ if let QPath::Resolved(_, path) = *path;
if let [ty] = &*path.segments;
then {
- let name = &ty.ident.name.as_str();
- INTS.iter().find(|c| name == *c).cloned()
+ let name = ty.ident.name.as_str();
+ INTS.iter().find(|c| &name == *c).copied()
} else {
None
}