Function original_location_for 

#[unsafe(no_mangle)]
pub extern "C" fn original_location_for(
    mappings: *mut Mappings<()>,
    generated_line: u32,
    generated_column: u32,
    bias: u32,
)

Find the mapping for the given generated location, if any exists.

If a mapping is found, the mapping_callback is invoked with it once. Otherwise, the mapping_callback is not invoked at all.