Am 06.04.2017 um 12:08 schrieb clipka:

> The recipe for desaster is as follows:
> 
>     <start of "local" scope>
>     #local <Identifier> = <Valid RValue>
>     #local <Identifier> =
>     <end of "local" scope>
>     <Valid RValue>
> 
> For example, the following also causes a crash:
> 
>     #macro Foo()
>       #local Bar=1;
>       #local Bar=
>     #end
> 
>     Foo()
> 
>     sphere {<0,0,0>,1}
> 
> The end of local scope causes the identifier and its content to be
> ditched, but the code responsible for parsing `#local` statements tries
> to ditch the content again in order to replace it with the new content.

The same kind of crash can also be triggered with the following construct:

    #declare Foo=1;
    #declare Foo=
    #undef Foo
    sphere {<0,0,0>,1}

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