[Pharo-dev] Creating a new class using `Class new superclass:` blocks the image in Pharo 7

[Andrei Chis]

Hi,

Executed in the latest Pharo 7 image
(Pharo-7.0.0+alpha.build.1310.sha.a454977bb3d55bc4fcca3a57ac2fafcf137c0f30
(64 Bit)) the code below blocks the image (both with latest and stable vm
on MacOs HighSierra). The vm does not crash but gets into a "Not
Responding" state and does not get out:

Class new
     superclass: GLMTransmission;
     setFormat: GLMTransmission format;
     classLayout: GLMTransmission classLayout copy;
     yourself

Code like this is used in Moose in some tests and in SmaCC in the rewrite
engine:

Class new
    superclass: SmaCCRewriteMatchContext;
    setFormat: SmaCCRewriteMatchContext format;
    classLayout: SmaCCRewriteMatchContext classLayout copy;
    yourself.

This worked in Pharo 6. Bug or here should be a different way to do this?

Cheers,
Andrei