// provided Request.
//
// If ServeHTTP panics, the server (the caller of ServeHTTP) assumes
// that the effect of the panic was isolated to the active request.
// It recovers the panic, logs a stack trace to the server error log,
// and either closes the network connection or sends an HTTP/2
// RST_STREAM, depending on the HTTP protocol. To abort a handler so
// the client sees an interrupted response but the server doesn't log

//	    Write a mutex contention profile to the specified file
//	    when all tests are complete.
//	    Writes test binary as -c would.
//
//	-mutexprofilefraction n
//	    Sample 1 in n stack traces of goroutines holding a
//	    contended mutex.
//
//	-outputdir directory
//	    Place output files from profiling in the specified directory,
//	    by default the directory in which "go test" is running.

		// internally (the same as if the server had closed the connection due to a
		// racing idle-timeout).
		//
		// With unlucky and very stable scheduling (as may be the case with the fake wasm
		// net stack), this can result in an infinite retry loop that doesn't
		// propagate the error up far enough for us to adjust the WriteTimeout.
		//
		// To avoid that problem, we explicitly forbid internal retries by rejecting

	// clang says "unknown argument".
	// tcc says "unsupported"
	// AIX says "not recognized"
	// Older versions of GCC say "unrecognised debug output level".
	// For -fsplit-stack GCC says "'-fsplit-stack' is not supported".
	supported := !bytes.Contains(out, []byte("unrecognized")) &&
		!bytes.Contains(out, []byte("unknown")) &&
		!bytes.Contains(out, []byte("unrecognised")) &&