Module must_use 

Re-exports

use std::iter; 🔒

use rustc_attr_ir::find_attr; 🔒

use rustc_attr_ir::lang_items::LangItem; 🔒

use rustc_errors::pluralize; 🔒

use rustc_hir as hir; 🔒

use rustc_hir::def::DefKind; 🔒

use rustc_hir::def::Res; 🔒

use rustc_hir::def_id::DefId; 🔒

use rustc_infer::traits::util::elaborate; 🔒

use rustc_lint_defs::declare_lint; 🔒

use rustc_lint_defs::declare_lint_pass; 🔒

use rustc_middle::ty; 🔒

use rustc_middle::ty::Ty; 🔒

use rustc_middle::ty::Unnormalized; 🔒

use rustc_span::Span; 🔒

use rustc_span::Symbol; 🔒

use rustc_span::sym; 🔒

use tracing::instrument; 🔒

use tracing::instrument; 🔒

use crate::diagnostics::UnusedClosure; 🔒

use crate::diagnostics::UnusedCoroutine; 🔒

use crate::diagnostics::UnusedDef; 🔒

use crate::diagnostics::UnusedDefSuggestion; 🔒

use crate::diagnostics::UnusedOp; 🔒

use crate::diagnostics::UnusedOpSuggestion; 🔒

use crate::diagnostics::UnusedResult; 🔒

use crate::LateContext; 🔒

use crate::LateLintPass; 🔒

use crate::LintContext; 🔒

Structs

UnusedResults

Enums

IsTyMustUse

Must the type be used?

MustUsePath

A path through a type to a must_use source. Contains useful info for the lint.

Statics

UNUSED_MUST_USE

The unused_must_use lint detects unused result of a type flagged as #[must_use].

UNUSED_RESULTS

The unused_results lint checks for the unused result of an expression in a statement.

Functions

check_fn_must_use 🔒

Checks if expr is a [method] call expression marked as #[must_use] and emits a lint if so. Returns true if the lint has been emitted.

check_must_use_def 🔒

Returns whether further errors should be suppressed because a lint has been emitted.

emit_must_use_untranslated 🔒

is_def_must_use 🔒

is_ty_must_use

Returns Some(path) if ty should be considered as “must_use” in the context of expr (expr is used to get the parent module, which can affect which types are considered uninhabited).