Diagnostics

assert(condition) and assert(condition, message) remain active in debug and release builds. Failure output includes the source location and optional message, then terminates the process.

Use std.debug.write or write_line for best-effort diagnostic output. Both return Bool so callers can observe an output failure. std.debug.trap() terminates immediately and does not unwind or guarantee destruction.

if (!std.debug.write_line("loading configuration")) {
    return 1;
}

panic(message) writes the message and a newline to standard error, then aborts. Jiang does not provide an unwinding panic: panic, trap, and std.process.exit do not run scope cleanup. Use T@E for failures that the caller can recover from.

std.build.mode is a read-only BuildMode value for compile-time debug/release selection. Debugger control, profiling, backtraces, and core-dump management are outside the standard-library API.