// Comptime return-trace resolution (ERR E3.0 slice 3b). A `#run` block that
// raises, propagates via `try`, and catches the error, then formats the trace
// with `trace.print_current()`. At comptime a frame is a packed
// `(func_id, span.start)` (not a `*Frame`); the interpreter's `.trace_resolve`
// unpacks it and resolves `file:line:col` via the module + source map — so the
// comptime trace prints the same `func at file:line:col` form as a runtime one.
// Expected exit: 0 (the error is caught; the trace is printed during the build).

#import "modules/std.sx";
trace :: #import "modules/std/trace.sx";

TErr :: error { Bad };

leaf :: () -> !TErr {
    raise error.Bad;
}

mid :: () -> !TErr {
    try leaf();
}

probe :: () {
    mid() catch (e) {
        print("comptime caught {}\n", e);
        trace.print_current();
    };
}

#run probe();

main :: () -> i32 {
    return 0;
}