================================================================================
Tuple struct patterns
================================================================================

match x {
  Some(x) => "some",
  std::None() => "none"
}

--------------------------------------------------------------------------------

(source_file
  (expression_statement
    (match_expression
      (identifier)
      (match_block
        (match_arm
          (match_pattern
            (tuple_struct_pattern
              (identifier)
              (identifier)))
          (string_literal))
        (match_arm
          (match_pattern
            (tuple_struct_pattern
              (scoped_identifier
                (identifier)
                (identifier))))
          (string_literal))))))

================================================================================
Reference patterns
================================================================================

match x {
  A(ref x) => x.0,
  ref mut y => y,
  & mut  z => z,
}

--------------------------------------------------------------------------------

(source_file
  (expression_statement
    (match_expression
      (identifier)
      (match_block
        (match_arm
          (match_pattern
            (tuple_struct_pattern
              (identifier)
              (ref_pattern
                (identifier))))
          (field_expression
            (identifier)
            (integer_literal)))
        (match_arm
          (match_pattern
            (ref_pattern
              (mut_pattern
                (mutable_specifier)
                (identifier))))
          (identifier))
        (match_arm
          (match_pattern
            (reference_pattern
              (mutable_specifier)
              (identifier)))
          (identifier))))))

================================================================================
Struct patterns
================================================================================

match x {
  Person{name, age} if age < 5 => ("toddler", name),
  Person{name: adult_name, age: _} => ("adult", adult_name),
}

--------------------------------------------------------------------------------

(source_file
  (expression_statement
    (match_expression
      (identifier)
      (match_block
        (match_arm
          (match_pattern
            (struct_pattern
              (type_identifier)
              (field_pattern
                (shorthand_field_identifier))
              (field_pattern
                (shorthand_field_identifier)))
            (binary_expression
              (identifier)
              (integer_literal)))
          (tuple_expression
            (string_literal)
            (identifier)))
        (match_arm
          (match_pattern
            (struct_pattern
              (type_identifier)
              (field_pattern
                (field_identifier)
                (identifier))
              (field_pattern
                (field_identifier))))
          (tuple_expression
            (string_literal)
            (identifier)))))))

================================================================================
Ignored patterns
================================================================================

match x {
  (a, ..) => a,
  B(..) => c,
  D::E{f: g, ..} => g
}

--------------------------------------------------------------------------------

(source_file
  (expression_statement
    (match_expression
      (identifier)
      (match_block
        (match_arm
          (match_pattern
            (tuple_pattern
              (identifier)
              (remaining_field_pattern)))
          (identifier))
        (match_arm
          (match_pattern
            (tuple_struct_pattern
              (identifier)
              (remaining_field_pattern)))
          (identifier))
        (match_arm
          (match_pattern
            (struct_pattern
              (scoped_type_identifier
                (identifier)
                (type_identifier))
              (field_pattern
                (field_identifier)
                (identifier))
              (remaining_field_pattern)))
          (identifier))))))

================================================================================
Captured patterns
================================================================================

match x {
  a @ A(_) | b @ B(..) => a,
  a @ 1 ... 5 => a,
  Some(1 ... 5) => a,
  a @ b...c => a,
  a @ b..=c => a,
}

--------------------------------------------------------------------------------

(source_file
  (expression_statement
    (match_expression
      value: (identifier)
      body: (match_block
        (match_arm
          pattern: (match_pattern
            (or_pattern
              (captured_pattern
                (identifier)
                (tuple_struct_pattern
                  type: (identifier)))
              (captured_pattern
                (identifier)
                (tuple_struct_pattern
                  type: (identifier)
                  (remaining_field_pattern)))))
          value: (identifier))
        (match_arm
          pattern: (match_pattern
            (captured_pattern
              (identifier)
              (range_pattern
                (integer_literal)
                (integer_literal))))
          value: (identifier))
        (match_arm
          pattern: (match_pattern
            (tuple_struct_pattern
              type: (identifier)
              (range_pattern
                (integer_literal)
                (integer_literal))))
          value: (identifier))
        (match_arm
          pattern: (match_pattern
            (captured_pattern
              (identifier)
              (range_pattern
                (identifier)
                (identifier))))
          value: (identifier))
        (match_arm
          pattern: (match_pattern
            (captured_pattern
              (identifier)
              (range_pattern
                (identifier)
                (identifier))))
          value: (identifier))))))

================================================================================
Or patterns
================================================================================

if let A(x) | B(x) = expr {
    do_stuff_with(x);
}

while let A(x) | B(x) = expr {
    do_stuff_with(x);
}

let Ok(index) | Err(index) = slice.binary_search(&x);

for ref a | b in c {}

let Ok(x) | Err(x) = binary_search(x);

for A | B | C in c {}

|(Ok(x) | Err(x))| expr();

let ref mut x @ (A | B | C);

fn foo((1 | 2 | 3): u8) {}

if let x!() | y!() = () {}

// Discomment after box pattern land on master
// let box (A | B | C);

// Not handled cause devs didn't got into agreement if should be acceptd or not
// |Ok(x) | Err(x)| expr();

--------------------------------------------------------------------------------

(source_file
  (expression_statement
    (if_expression
      condition: (let_condition
        pattern: (or_pattern
          (tuple_struct_pattern
            type: (identifier)
            (identifier))
          (tuple_struct_pattern
            type: (identifier)
            (identifier)))
        value: (identifier))
      consequence: (block
        (expression_statement
          (call_expression
            function: (identifier)
            arguments: (arguments
              (identifier)))))))
  (expression_statement
    (while_expression
      condition: (let_condition
        pattern: (or_pattern
          (tuple_struct_pattern
            type: (identifier)
            (identifier))
          (tuple_struct_pattern
            type: (identifier)
            (identifier)))
        value: (identifier))
      body: (block
        (expression_statement
          (call_expression
            function: (identifier)
            arguments: (arguments
              (identifier)))))))
  (let_declaration
    pattern: (or_pattern
      (tuple_struct_pattern
        type: (identifier)
        (identifier))
      (tuple_struct_pattern
        type: (identifier)
        (identifier)))
    value: (call_expression
      function: (field_expression
        value: (identifier)
        field: (field_identifier))
      arguments: (arguments
        (reference_expression
          value: (identifier)))))
  (expression_statement
    (for_expression
      pattern: (or_pattern
        (ref_pattern
          (identifier))
        (identifier))
      value: (identifier)
      body: (block)))
  (let_declaration
    pattern: (or_pattern
      (tuple_struct_pattern
        type: (identifier)
        (identifier))
      (tuple_struct_pattern
        type: (identifier)
        (identifier)))
    value: (call_expression
      function: (identifier)
      arguments: (arguments
        (identifier))))
  (expression_statement
    (for_expression
      pattern: (or_pattern
        (or_pattern
          (identifier)
          (identifier))
        (identifier))
      value: (identifier)
      body: (block)))
  (expression_statement
    (closure_expression
      parameters: (closure_parameters
        (tuple_pattern
          (or_pattern
            (tuple_struct_pattern
              type: (identifier)
              (identifier))
            (tuple_struct_pattern
              type: (identifier)
              (identifier)))))
      body: (call_expression
        function: (identifier)
        arguments: (arguments))))
  (let_declaration
    pattern: (ref_pattern
      (mut_pattern
        (mutable_specifier)
        (captured_pattern
          (identifier)
          (tuple_pattern
            (or_pattern
              (or_pattern
                (identifier)
                (identifier))
              (identifier)))))))
  (function_item
    name: (identifier)
    parameters: (parameters
      (parameter
        pattern: (tuple_pattern
          (or_pattern
            (or_pattern
              (integer_literal)
              (integer_literal))
            (integer_literal)))
        type: (primitive_type)))
    body: (block))
  (expression_statement
    (if_expression
      condition: (let_condition
        pattern: (or_pattern
          (macro_invocation
            macro: (identifier)
            (token_tree))
          (macro_invocation
            macro: (identifier)
            (token_tree)))
        value: (unit_expression))
      consequence: (block)))
  (line_comment)
  (line_comment)
  (line_comment)
  (line_comment))

================================================================================
Inline const or Const blocks as pattern
================================================================================

fn foo(x: i32) {
    const CUBE: i32 = 3.pow(3);
    match x {
        CUBE => println!("three cubed"),
        _ => {}
    }
}

fn foo(x: i32) {
    match x {
        const { 3.pow(3) } => println!("three cubed"),
        _ => {}
    }
}

--------------------------------------------------------------------------------

(source_file
  (function_item
    name: (identifier)
    parameters: (parameters
      (parameter
        pattern: (identifier)
        type: (primitive_type)))
    body: (block
      (const_item
        name: (identifier)
        type: (primitive_type)
        value: (call_expression
          function: (field_expression
            value: (integer_literal)
            field: (field_identifier))
          arguments: (arguments
            (integer_literal))))
      (expression_statement
        (match_expression
          value: (identifier)
          body: (match_block
            (match_arm
              pattern: (match_pattern
                (identifier))
              value: (macro_invocation
                macro: (identifier)
                (token_tree
                  (string_literal))))
            (match_arm
              pattern: (match_pattern)
              value: (block)))))))
  (function_item
    name: (identifier)
    parameters: (parameters
      (parameter
        pattern: (identifier)
        type: (primitive_type)))
    body: (block
      (expression_statement
        (match_expression
          value: (identifier)
          body: (match_block
            (match_arm
              pattern: (match_pattern
                (const_block
                  body: (block
                    (call_expression
                      function: (field_expression
                        value: (integer_literal)
                        field: (field_identifier))
                      arguments: (arguments
                        (integer_literal))))))
              value: (macro_invocation
                macro: (identifier)
                (token_tree
                  (string_literal))))
            (match_arm
              pattern: (match_pattern)
              value: (block))))))))
