Function cmd_dump_shader 

pub(crate) fn cmd_dump_shader(
    preset_path: PathBuf,
    kind: DumpKind,
) -> Result<()>

Run a preset’s warp_shader / comp_shader HLSL through the translator and print the resulting WGSL on stdout. Failures print the translator’s error to stderr and continue (so --kind=both still emits the other shader). Exit code is non-zero only when nothing at all could be emitted.