Function doshfunc 

pub fn doshfunc(
    shfunc: &mut shfunc,
    doshargs: Vec<String>,
    noreturnval: bool,
    body_runner: impl FnMut() -> i32,
) -> i32

Port of doshfunc() from Src/exec.c:5823 — C decl doshfunc(Shfunc shfunc, LinkList doshargs, int noreturnval).