if statement does not work with variables

Created by: msehnout

We need to handle variable names in conditions so we can compare them. The if statement implementation is pretty simple right now. Do you have any other idea what could be implemented and how to improve it?

Reproduction: Add debug message:

diff --git a/src/main.rs b/src/main.rs
index d614815..aa2d50a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -260,6 +260,7 @@ impl Shell {
     }
 
     fn handle_if(&mut self, left: String, comparitor: Comparitor, right: String) {
+        println!("DBG: {:?} == {:?}", left, right);
         let value = match comparitor {
             Comparitor::GreaterThan        => { left >  right },
             Comparitor::GreaterThanOrEqual => { left >= right },

Run this script:

let test=0

if $test == 0
    echo pass
else
    echo fail
end

Expected behavior: pass

Actual behavior: [describe the actual behavior, which is presented through the repro.].

cargo run examples/variable_number_comparison.ion
    Finished dev [unoptimized + debuginfo] target(s) in 0.0 secs
     Running `target/debug/ion examples/variable_number_comparison.ion`
DBG: "$test" == "0"
fail