# Program
Status: 🟢
Assertions: 1
```rustleaf
var arr = [1, 2, 3];
arr[0] = 99;
assert(arr == [99, 2, 3]);
```
# 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 (LeftBracket)
consume_token: position 3 consumed LeftBracket
parse_primary: success - parsing list literal
parse_list_literal: starting at position 4
parse_list_literal: parsing element at position 4
parse_expression: starting at position 4 (Int(1))
consume_token: position 4 consumed Int
parse_primary: success - parsed numeric/string literal
parse_expression: success - parsed precedence expression
consume_token: position 5 consumed Comma
parse_list_literal: found comma, checking for more elements
parse_list_literal: parsing element at position 6
parse_expression: starting at position 6 (Int(2))
consume_token: position 6 consumed Int
parse_primary: success - parsed numeric/string literal
parse_expression: success - parsed precedence expression
consume_token: position 7 consumed Comma
parse_list_literal: found comma, checking for more elements
parse_list_literal: parsing element at position 8
parse_expression: starting at position 8 (Int(3))
consume_token: position 8 consumed Int
parse_primary: success - parsed numeric/string literal
parse_expression: success - parsed precedence expression
parse_list_literal: no comma, expecting ]
parse_list_literal: expecting ] at position 9
consume_token: position 9 consumed RightBracket
parse_list_literal: success
parse_expression: success - parsed precedence expression
consume_token: position 10 consumed Semicolon
parse_statement: success - parsed var declaration
parse_program: parsing statement at position 11 (Ident(arr))
parse_statement: starting at position 11 (Ident(arr))
consume_token: position 11 consumed Ident
consume_token: position 12 consumed LeftBracket
parse_expression: starting at position 13 (Int(0))
consume_token: position 13 consumed Int
parse_primary: success - parsed numeric/string literal
parse_expression: success - parsed precedence expression
consume_token: position 14 consumed RightBracket
consume_token: position 15 consumed Equal
parse_expression: starting at position 16 (Int(99))
consume_token: position 16 consumed Int
parse_primary: success - parsed numeric/string literal
parse_expression: success - parsed precedence expression
consume_token: position 17 consumed Semicolon
parse_statement: success - parsed assignment
parse_program: parsing statement at position 18 (Ident(assert))
parse_statement: starting at position 18 (Ident(assert))
consume_token: position 18 consumed Ident
parse_statement: falling back to expression statement
parse_expression: starting at position 18 (Ident(assert))
consume_token: position 18 consumed Ident
parse_primary: success - parsed identifier (assert)
consume_token: position 19 consumed LeftParen
parse_expression: starting at position 20 (Ident(arr))
consume_token: position 20 consumed Ident
parse_primary: success - parsed identifier (arr)
consume_token: position 21 consumed EqualEqual
consume_token: position 22 consumed LeftBracket
parse_primary: success - parsing list literal
parse_list_literal: starting at position 23
parse_list_literal: parsing element at position 23
parse_expression: starting at position 23 (Int(99))
consume_token: position 23 consumed Int
parse_primary: success - parsed numeric/string literal
parse_expression: success - parsed precedence expression
consume_token: position 24 consumed Comma
parse_list_literal: found comma, checking for more elements
parse_list_literal: parsing element at position 25
parse_expression: starting at position 25 (Int(2))
consume_token: position 25 consumed Int
parse_primary: success - parsed numeric/string literal
parse_expression: success - parsed precedence expression
consume_token: position 26 consumed Comma
parse_list_literal: found comma, checking for more elements
parse_list_literal: parsing element at position 27
parse_expression: starting at position 27 (Int(3))
consume_token: position 27 consumed Int
parse_primary: success - parsed numeric/string literal
parse_expression: success - parsed precedence expression
parse_list_literal: no comma, expecting ]
parse_list_literal: expecting ] at position 28
consume_token: position 28 consumed RightBracket
parse_list_literal: success
parse_expression: success - parsed precedence expression
consume_token: position 29 consumed RightParen
parse_expression: success - parsed precedence expression
consume_token: position 30 consumed Semicolon
parse_program: parsed 3 statements
```
# Result
```rust
Ok(
Unit,
)
```
# Lex
```rust
Ok(
[
0: Token(Var),
1: Token(Ident, "arr"),
2: Token(Equal),
3: Token(LeftBracket),
4: Token(Int, "1"),
5: Token(Comma),
6: Token(Int, "2"),
7: Token(Comma),
8: Token(Int, "3"),
9: Token(RightBracket),
10: Token(Semicolon),
11: Token(Ident, "arr"),
12: Token(LeftBracket),
13: Token(Int, "0"),
14: Token(RightBracket),
15: Token(Equal),
16: Token(Int, "99"),
17: Token(Semicolon),
18: Token(Ident, "assert"),
19: Token(LeftParen),
20: Token(Ident, "arr"),
21: Token(EqualEqual),
22: Token(LeftBracket),
23: Token(Int, "99"),
24: Token(Comma),
25: Token(Int, "2"),
26: Token(Comma),
27: Token(Int, "3"),
28: Token(RightBracket),
29: Token(RightParen),
30: Token(Semicolon),
31: Token(Eof)
],
)
```
# Parse
```rust
Ok(
Program(
[
VarDecl {
pattern: Variable(
"arr",
),
value: Some(
List(
[
Literal(
Int(
1,
),
),
Literal(
Int(
2,
),
),
Literal(
Int(
3,
),
),
],
),
),
},
Assignment {
target: GetItem(
Identifier(
"arr",
),
Literal(
Int(
0,
),
),
),
op: Assign,
value: Literal(
Int(
99,
),
),
},
Expression(
FunctionCall(
Identifier(
"assert",
),
[
Eq(
Identifier(
"arr",
),
List(
[
Literal(
Int(
99,
),
),
Literal(
Int(
2,
),
),
Literal(
Int(
3,
),
),
],
),
),
],
),
),
],
),
)
```
# Eval
```rust
Ok(
RustValue(<unknown>),
)
```