starlark: reject double-signs and misplaced signs in int (#112)

The implementation of the int built-in explicitly handles signs
and then strips them. It then passes the remaining string to math/big.
However, math/big also accepts and handles signs. This led to
int("--4") returning 4 (somewhat correctly), and to
int("0x-4", 16) returning -4 (again, somewhat correctly).

Since we are handling sign explicitly, check for and complain about
signs in strings we are about to pass in to math/big.

Follow-up to #108 and #109.

0 files changed, 0 insertions, 0 deletions