segfault on IO.print(new List)

[wren-lang]

segfault on IO.print(new List)

[kmarekspartz]

Or:

> var x = new List
> x.add(1)
wren(90830,0x7fff7748b310) malloc: *** error for object 0x2: pointer being realloc'd was not allocated
*** set a breakpoint in malloc_error_break to debug
zsh: abort      ./wren

[munificent]

Ah good catch. You can probably cause the same problem by calling new on any of the built-in classes: Bool, Num, Fiber, Function, etc.

The problem is that instances of those types are special in the VM. Calling new creates the wrong type and then methods on that object go haywire.

It would be nice if new List and new Fiber could be made to do something useful, but that will be tricky with the sematics of how new is compiled. The simplest fix is probably just to make those classes implement new methods that raise runtime errors.

[tamc]

Can't replicate this as of 84ead3b on OSX Yosemite

> IO.print(new List)
[]
> var x = new List
> x.add(1)
>

Is it fixed?

[kmarekspartz]

I'll try this out today.

[kmarekspartz]

It works for me now.

[munificent]

\o/