// Unified float→int narrowing rule (F0.11), POSITIVE side: an INTEGRAL float
// flowing into an integer-typed binding FOLDS to its integer — the same
// `floatToIntExact` rule an array dimension / `$K: Count` already uses — across
// a typed LOCAL, a struct FIELD default, a typed module CONST, and a function
// PARAM default. It folds whether written as a float LITERAL (`4.0`) or a
// const-EXPRESSION (`M + 2.0`). The escape hatch (`xx` / `cast`) still TRUNCATES
// any float, integral or not — including a non-integral const expression.
//
// Companion to the negative example 1146 (non-integral floats error).
// Regression (issue 0095): a typed local/param/field silently truncated a float
// initializer (`y : s64 = 1.5` → 1) with no diagnostic, and a non-integral const
// EXPRESSION (`M + 0.5`) truncated even when written through an int binding; the
// rule now folds an integral float (literal or expression) and rejects a
// non-integral one.
#import "modules/std.sx";

M :: 2;   // module const, for the const-EXPRESSION cases

Box :: struct {
    n  : s64 = 4.0;       // integral float field default → folds to 4
    ne : s64 = M + 2.0;   // integral float EXPRESSION field default → folds to 4
}

withDefault :: (x : s64 = 6.0) -> s64 { return x; }   // param default → 6

K : s64 : 8.0;          // integral float module const → folds to 8

main :: () {
    // Typed local: integral float folds (literal + expression).
    z : s64 = 4.0;
    ze : s64 = M + 2.0;
    print("local={} localExpr={}\n", z, ze);

    // Negative integral float folds to its (negative) integer.
    neg : s64 = -2.0;
    print("neg={}\n", neg);

    // Struct field defaults fold (literal + expression).
    b := Box.{};
    print("field={} fieldExpr={}\n", b.n, b.ne);

    // Param default folds.
    print("param={}\n", withDefault());

    // Module const folds (and can drive an array dimension: len 8).
    a : [K]s64 = ---;
    print("const={} len={}\n", K, a.len);

    // Explicit escape: `xx` / `cast` always truncate, integral or not —
    // including a non-integral const EXPRESSION (`xx (M + 0.5)` → 2).
    e : s64 = xx 4.9;
    c : s64 = cast(s64) 1.5;
    xc : s64 = xx (M + 0.5);
    print("xx={} cast={} xxExpr={}\n", e, c, xc);
}