// A branch condition (`if` / `while` / `and` / `or`) must reduce to an i1:
// its type must be a bool, integer, pointer, or optional. A struct (or float,
// etc.) has no truthiness — it used to be silently folded truthy at lowering
// then `@panic` in the LLVM backend (issue 0164). It must instead be a clean,
// located compile-time TYPE error.
//
// Negative test: locks the new diagnostic. `if <struct>` is rejected.
#import "modules/std.sx";

S :: struct { x: i64; }

main :: () -> i64 {
    s : S = .{ x = 1 };
    if s { return 1; }   // ERROR: condition must be a bool, integer, pointer, or optional
    return 0;
}