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Check for full paths that are cyclic - i.e. a situation where a high level object incorporates in its definition tree a reference to itself. Such definitions are always considered invalid, and are sometimes problematic for tools working with geometry hierarchy.

Check for references to objects or files that are missing (not present in the database or on the file system.) Primarily this is a check for comb objects referring to missing objects, but it will also check for and report invalid object and file references in extrude and dsp primitives.

Check for shapes in the database that do not satisfy one or more properties required for them to be valid definitions, where correcting the problem requires a change to the object's definition. (As of this writing the only implemented check is for BoT object solidity, but many more are possible and planned.) (Objects invalid due to missing objects are potentially valid without the necessity of changing the object's own definition - e.g. the missing object/file can be added. That category of error can be searched for with the -M check.)

Checking for invalid objects...
Found invalid objects:
  nonsolid.bot[bot] failed bot solid test
      

Checking for cyclic paths...
Checking for references to non-extant objects...
Checking for invalid objects...
Found cyclic paths:
  /c1/c2/c1
  /c2/c1/c2
Found references to missing objects:
  invalid_dsp_missing_binary_obj.s/missing_binary_object.s
  invalid_dsp_missing_file.s/missing_file.data
  invalid_extrude_missing_sketch.s/missing_sketch.s
  missingentry.c/missing.s
Found invalid objects:
  nonsolid.bot[bot] failed bot solid test