Function install_argv_remaps 

pub fn install_argv_remaps<'r, I>(
    executor: &mut Executor<'_>,
    rules: I,
) -> Result<(), RemapArg<'r>>
where
    I: IntoIterator<Item = RemapArg<'r>>,
    I::IntoIter: Clone,

Install parsed -r rules in executor’s remap table as its FALLBACK tier.

They then reach every entity the executor creates on every road — Executor::resolve_entity_name_for (C, C++), the Rust component sink (through argv_fallback) and Executor::create_node’s handle — and in each, a launch rule for the same name still wins.

All or nothing: on failure nothing is installed and the rule that did not fit is returned (a full table — MAX_REMAPS slots are shared with launch rules — or a name past its slot’s length). Silently installing a prefix of the rules would be a partial version of the drop this exists to prevent.