Function peel_casts 

pub(crate) fn peel_casts<'tcx>(
    cx: &LateContext<'tcx>,
    e: &'tcx Expr<'tcx>,
) -> &'tcx Expr<'tcx>

Given an expression, peel all of casts (<expr> as ..., <expr>.cast{,_mut,_const}(), ptr::from_ref(<expr>), …) and init expressions.

Returns the innermost expression.