// Comptime host-FFI: a `#run` that calls real libc functions (`toupper`/`tolower`)
// at compile time. The comptime VM resolves the symbol via dlsym and dispatches
// through the host_ffi trampolines (Phase 4D) — a scalar arg in, a scalar return
// out — folding the result into a constant. (The legacy interpreter does the same
// via its own dlsym path; both agree.)
#import "modules/std.sx";

toupper :: (c: i32) -> i32 extern libc;
tolower :: (c: i32) -> i32 extern libc;

UP :: #run toupper(97);   // 'a' -> 'A' = 65
LO :: #run tolower(90);   // 'Z' -> 'z' = 122

main :: () -> i32 {
    print("toupper(97)={} tolower(90)={}\n", UP, LO);
    return 0;
}