[NTG-context] Why does this METAPOST vardef 'save' statement fail?

[Gerben Wierda]

Answering myself: pth2 is not a valid variable name. Digits are not allowed.

> On 14 Mar 2020, at 15:45, Gerben Wierda <gerben.wierda at rna.nl> wrote:
> 
> I have this vardef:
> 
> vardef Foo(expr w, h) =
>    save pth; path pth;
>    %save pth2; path pth2;
>    save pic; picture pic;
>    pth = fullsquare xysized (w, h);
>    %pth2 = fullsquare xysized (h/4, h/8)
>    pic := image (
>        draw pth;
>        %draw pth2 shifted (-w/2, -h/4);
>        % all kind of stuff here
>    );
>    setbounds pic to pth;
>    pic
> enddef ;
> 
> As soon as I uncomment the bold line (first comment) a mtxrun fails. Whatever I try, a single save statement, etc., I fail in getting a second local variable. The METAPOST manual is no help.
> 
> The error shown is:
> 
> metapost log    > ! Extra tokens will be flushed.
> metapost log    > <to be read again> 
> metapost log    >                    2
> metapost log    > Foo->...h;path.pth;save.pth2
> metapost log    >                                                   ;path.pth2;save.pic;pictur...
> metapost log    > <*> ... ; s := Foo(8cm, 2cm)
> metapost log    >                                                   ; draw s; drawdot center l...
> metapost log    > 
> 
> Why?
> 
> G
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