rustleaf 0.1.0

A simple programming language interpreter written in Rust
Documentation 
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# Program
Status: 🟢
Assertions: 1

```rustleaf
var x = 42;
assert(x == 42);
```

# Output
```
parse_program: starting
parse_program: parsing statement at position 0 (Var)
parse_statement: starting at position 0 (Var)
consume_token: position 0 consumed Var
consume_token: position 1 consumed Ident
consume_token: position 2 consumed Equal
parse_expression: starting at position 3 (Int(42))
consume_token: position 3 consumed Int
parse_primary: success - parsed numeric/string literal
parse_expression: success - parsed precedence expression
consume_token: position 4 consumed Semicolon
parse_statement: success - parsed var declaration
parse_program: parsing statement at position 5 (Ident(assert))
parse_statement: starting at position 5 (Ident(assert))
consume_token: position 5 consumed Ident
parse_statement: falling back to expression statement
parse_expression: starting at position 5 (Ident(assert))
consume_token: position 5 consumed Ident
parse_primary: success - parsed identifier (assert)
consume_token: position 6 consumed LeftParen
parse_expression: starting at position 7 (Ident(x))
consume_token: position 7 consumed Ident
parse_primary: success - parsed identifier (x)
consume_token: position 8 consumed EqualEqual
consume_token: position 9 consumed Int
parse_primary: success - parsed numeric/string literal
parse_expression: success - parsed precedence expression
consume_token: position 10 consumed RightParen
parse_expression: success - parsed precedence expression
consume_token: position 11 consumed Semicolon
parse_program: parsed 2 statements
```

# Result
```rust
Ok(
    Unit,
)
```

# Lex
```rust
Ok(
    [
        0: Token(Var),
        1: Token(Ident, "x"),
        2: Token(Equal),
        3: Token(Int, "42"),
        4: Token(Semicolon),
        5: Token(Ident, "assert"),
        6: Token(LeftParen),
        7: Token(Ident, "x"),
        8: Token(EqualEqual),
        9: Token(Int, "42"),
        10: Token(RightParen),
        11: Token(Semicolon),
        12: Token(Eof)
    ],
)
```

# Parse
```rust
Ok(
    Program(
        [
            VarDecl {
                pattern: Variable(
                    "x",
                ),
                value: Some(
                    Literal(
                        Int(
                            42,
                        ),
                    ),
                ),
            },
            Expression(
                FunctionCall(
                    Identifier(
                        "assert",
                    ),
                    [
                        Eq(
                            Identifier(
                                "x",
                            ),
                            Literal(
                                Int(
                                    42,
                                ),
                            ),
                        ),
                    ],
                ),
            ),
        ],
    ),
)
```

# Eval
```rust
Ok(
    RustValue(<unknown>),
)
```