Function codegen_monomorphic_program_c 

pub fn codegen_monomorphic_program_c(
    stmts: &[Stmt<'_>],
    _registry: &TypeRegistry,
    interner: &Interner,
    policies: &PolicyRegistry,
    instances: &HashMap<Symbol, TypeInstance>,
    tier: TaskTier,
) -> String

codegen_program_c for a monomorphized program: instances names the generic type each instance type applies, so its values show under the generic’s name.