shrink_to_fit method corrupts an empty bitset

[alexeiakimov]

Bug in BitSet::shrink_to_fit method

Crate version: 0.5.2

Description: BitSet::shrink_to_fit(...) method being applied to a newly created bitset corrupts the internals state of the bit set. The following test demonstrates the problem:

#[test]
fn shrink_new_bit_set() {
    let mut set = BitSet::new();
    set.shrink_to_fit();
    set.contains(1);
}

The last line panics with message "index out of bounds". The cause is that in lib.rs, line 389 the trunc_len is set to 1 if there are no blocks, after truncation the vector of blocks is still empty but the number of bits is set to the size of the single block.

[Gankra]

wow, yep! good catch!

[Gankra]

fixed in 0.5.3, which is now published