log: tag log.fatal with @[noreturn]

vlib/log/default.v

@@ -30,8 +30,12 @@ pub fn set_level(level Level) {
 }
 
 // fatal logs a `fatal` message, using the default Logger instance
+@[noreturn]
 pub fn fatal(s string) {
 	default_logger.fatal(s)
+	// the compiler currently has no way to mark functions in an interface
+	// as @[noreturn], so we need to make sure this is never returning ourselves
+	exit(1)
 }
 
 // error logs an `error` message, using the default Logger instance

vlib/log/log_test.v

@@ -136,3 +136,11 @@ fn test_log_time_format() {
 	assert true
 	println(@FN + ' end')
 }
+
+fn make_error() ?string {
+	return 'ok'
+}
+
+fn test_log_default_fatal_has_noreturn() {
+	_ := make_error() or { fatal('error') }
+}