Assertion failure in pkl_ast_make_integral_type

[John Darrington]

This code:

defun foo = (offset<byte[],byte> input, int len) int:
{
    defvar ret = 0;
    return ret;
}


foo (0x10#B, 0);

Causes poke to assert with:

poke/src/pkl-ast.c:339: pkl_ast_make_integral_type: Assertion `signed_p == 0 || 
signed_p == 1' failed.
Aborted