HTTP/1.1 -1 Read error in cache disk data: SuccessContent-Type: text/csv; charset="utf-8" Last-Modified: Sat, 22 Jan 2022 01:57:40 GMT Content-length: 1698 Connection: Close Proxy-Connection: Close X-Cache: HIT from web1.osuosl.org Server: ProxyTrack 0.5 (HTTrack 3.49.2) id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,lang,patch,platform 1520,P6metaclass cannot derive from already-`register`ed PMC type,Austin_Hastings,,"Registering a PMC-proxy seems to be enough to prevent its use as a parent class. {{{ austin@andLinux:~/kakapo$ cat test.nqp INIT { P6metaclass.register('Hash'); } class Foo is Hash { INIT { say(""Hello, Foo""); } } austin@andLinux:~/kakapo$ parrot-nqp test.nqp Could not build C3 linearization: ambiguous hierarchy current instr.: 'parrot;P6metaclass;register' pc 532 (runtime/parrot/library/P6object.pir:408) called from Sub '' pc -1 ((unknown file):-1) called from Sub 'parrot;PCT;HLLCompiler;evalpmc' pc 972 (compilers/pct/src/PCT/HLLCompiler.pir:538) ... call repeated 1 times called from Sub 'parrot;PCT;HLLCompiler;compile' pc 388 (compilers/pct/src/PCT/HLLCompiler.pir:287) called from Sub 'parrot;PCT;HLLCompiler;eval' pc 992 (compilers/pct/src/PCT/HLLCompiler.pir:556) called from Sub 'parrot;PCT;HLLCompiler;evalfiles' pc 1303 (compilers/pct/src/PCT/HLLCompiler.pir:707) called from Sub 'parrot;PCT;HLLCompiler;command_line' pc 1489 (compilers/pct/src/PCT/HLLCompiler.pir:794) called from Sub 'parrot;NQP;Compiler;main' pc -1 ((unknown file):-1) }}} I suspect (based on scanning a trace, but not based on ''poring over'' the trace) that the problem lies in the `get_parrotclass` method. The '''major''' impact for me is interoperation between the Kakapo library, which registers a large collection of PMC types, and the PCT/PGE tools, which build many of their classes as subtypes of Hash.",bug,new,major,,library,2.2.0,medium,,,,,, nd("h1,h2,h3,h4,h5,h6").add