rustc_middle/ty/
intrinsic.rs

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use rustc_macros::{Decodable, Encodable, HashStable};
use rustc_span::Symbol;
use rustc_span::def_id::DefId;

use super::TyCtxt;

#[derive(Copy, Clone, Debug, Decodable, Encodable, HashStable)]
pub struct IntrinsicDef {
    pub name: Symbol,
    /// Whether the intrinsic has no meaningful body and all backends need to shim all calls to it.
    pub must_be_overridden: bool,
}

impl TyCtxt<'_> {
    pub fn is_intrinsic(self, def_id: DefId, name: Symbol) -> bool {
        let Some(i) = self.intrinsic(def_id) else { return false };
        i.name == name
    }
}