Missing solutions for variable inference.

[NatanFreeman]

When using eval to parse variable's to the power only positive values are considered.

use kalk::parser;

fn main() {
    let mut parser_context = parser::Context::new();
    let result = parser::eval(&mut parser_context, &"x^2=4")
        .unwrap()
        .unwrap();

    println!("{}", result);
}

Outputs:

2

This is missing the solution x=-2.

[PaddiM8]

It does indeed only return one of the solutions when estimating solutions to equations. I guess it would be possible to make it return a vector of solutions in cases where there are several of them, but I'm not sure it would be able to find them all consistently and efficiently. Will look in to it more though.