use rustc_hir::intravisit as hir_visit;
use rustc_hir::intravisit::Visitor as HirVisitor;
use rustc_lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext};
-use rustc_middle::hir::map::Map;
+use rustc_middle::hir::nested_filter;
use rustc_middle::lint::in_external_macro;
use rustc_session::{declare_lint_pass, declare_tool_lint};
/// complexity.
///
/// ### Example
- /// ```rust,ignore
- /// // Bad
- /// let a = (|| 42)()
+ /// ```rust
+ /// let a = (|| 42)();
+ /// ```
///
- /// // Good
- /// let a = 42
+ /// Use instead:
+ /// ```rust
+ /// let a = 42;
/// ```
+ #[clippy::version = "pre 1.29.0"]
pub REDUNDANT_CLOSURE_CALL,
complexity,
"throwaway closures called in the expression they are defined"
impl<'ast> ast_visit::Visitor<'ast> for ReturnVisitor {
fn visit_expr(&mut self, ex: &'ast ast::Expr) {
- if let ast::ExprKind::Ret(_) = ex.kind {
- self.found_return = true;
- } else if let ast::ExprKind::Try(_) = ex.kind {
+ if let ast::ExprKind::Ret(_) | ast::ExprKind::Try(_) = ex.kind {
self.found_return = true;
}
if_chain! {
if let ast::ExprKind::Call(ref paren, _) = expr.kind;
if let ast::ExprKind::Paren(ref closure) = paren.kind;
- if let ast::ExprKind::Closure(_, _, _, ref decl, ref block, _) = closure.kind;
+ if let ast::ExprKind::Closure(_, _, _, _, ref decl, ref block, _) = closure.kind;
then {
let mut visitor = ReturnVisitor::new();
visitor.visit_expr(block);
count: usize,
}
impl<'a, 'tcx> hir_visit::Visitor<'tcx> for ClosureUsageCount<'a, 'tcx> {
- type Map = Map<'tcx>;
+ type NestedFilter = nested_filter::OnlyBodies;
fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
if_chain! {
hir_visit::walk_expr(self, expr);
}
- fn nested_visit_map(&mut self) -> hir_visit::NestedVisitorMap<Self::Map> {
- hir_visit::NestedVisitorMap::OnlyBodies(self.cx.tcx.hir())
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
}
}
let mut closure_usage_count = ClosureUsageCount { cx, path, count: 0 };
if_chain! {
if let hir::StmtKind::Local(local) = w[0].kind;
if let Option::Some(t) = local.init;
- if let hir::ExprKind::Closure(..) = t.kind;
+ if let hir::ExprKind::Closure { .. } = t.kind;
if let hir::PatKind::Binding(_, _, ident, _) = local.pat.kind;
if let hir::StmtKind::Semi(second) = w[1].kind;
if let hir::ExprKind::Assign(_, call, _) = second.kind;