Wren testing

wren/vm/wren_debug.h

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+#ifndef wren_debug_h
+#define wren_debug_h
+
+#include "wren_value.h"
+#include "wren_vm.h"
+
+// Prints the stack trace for the current fiber.
+//
+// Used when a fiber throws a runtime error which is not caught.
+void wrenDebugPrintStackTrace(WrenVM* vm);
+
+// The "dump" functions are used for debugging Wren itself. Normal code paths
+// will not call them unless one of the various DEBUG_ flags is enabled.
+
+// Prints a representation of [value] to stdout.
+void wrenDumpValue(Value value);
+
+// Prints a representation of the bytecode for [fn] at instruction [i].
+int wrenDumpInstruction(WrenVM* vm, ObjFn* fn, int i);
+
+// Prints the disassembled code for [fn] to stdout.
+void wrenDumpCode(WrenVM* vm, ObjFn* fn);
+
+// Prints the contents of the current stack for [fiber] to stdout.
+void wrenDumpStack(ObjFiber* fiber);
+
+#endif