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I was trying to debug an (unrelated) issue in the GC, and wanted to turn on the trace-level GC output by compiling it with -DRGENGC_DEBUG=5. Unfortunately, this actually causes a crash in newobj_init() because the code there tries to log the obj_info() of the newly created object. However, the object is not actually sufficiently set up for some of the things that obj_info() tries to do: * The instance variable table for a class is not yet initialized, and when using variable-length RVALUES, said ivar table is embedded in as-yet unitialized memory after the struct RValue. Attempting to read this, as obj_info() does, causes a crash. * T_DATA variables need to dereference their ->type field to print out the underlying C type name, which is not set up until newobj_fill() is called. To fix this, create a new method `obj_info_basic`, which dumps out only the parts of the object that are valid before the object is fully initialized. [Fixes #18795]