// Regression (issue 0060): a closure LITERAL passed directly as a bare
// function-type argument `(T) -> U` and then called inside the callee. The
// closure's underlying function takes a hidden env arg that a bare fn-ptr slot
// doesn't pass, so the compiler bridges a capture-free closure to the bare ABI
// with a generated adapter. Both block and arrow bodies. (The working contrast
// where the param is a `Closure(...)` type is examples/0302.)

#import "modules/std.sx";

apply :: (f: (s64) -> s64) -> s64 { return f(5); }
twice :: (f: (s64) -> s64, x: s64) -> s64 { return f(f(x)); }

main :: () {
    print("block={}\n", apply(closure((x: s64) -> s64 { return x * 2; })));  // 10
    print("arrow={}\n", apply(closure((x: s64) -> s64 => x * 2)));           // 10
    print("twice={}\n", twice(closure((x: s64) -> s64 => x + 3), 1));        // ((1+3)+3) = 7
}