experiment with being a linker

src/error.cpp

@@ -0,0 +1,9 @@
+#include "error.hpp"
+
+const char *err_str(int err) {
+    switch ((enum Error)err) {
+        case ErrorNoMem: return "out of memory";
+        case ErrorInvalidFormat: return "invalid format";
+    }
+    return "(invalid error)";
+}