{{1-1}} for simple math throws unexpected integer, expected end of variable block

[joshuataylor]

Description

Trying to do {{1-1}} throws the following error:

called `Result::unwrap()` on an `Err` value: Error { kind: SyntaxError, detail: Some("unexpected integer, expected end of variable block"), name: Some("ranges"), lineno: 1, source: None }

This is the smallest reproduction I can create, the main reason for this is for ranges:

{% for i in range(1, 5) %}
{{i-1}}
{% endfor %}

Reproduction steps

{{1-1}}

Additional helpful information:

## What did you expect
Working math :)

[joshuataylor]

It looks like this works:

{{1 - 1}}

This is because without a space, Minijinja parses it as a -1 (Negative 1).

Ok(
    Some(
        (
            INT(-1),
             @ 1:4-1:5,
        ),
    ),
)