================================================================================
The header, registers and every scalar type
================================================================================

OPENQASM 3.0;
include "stdgates.inc";
qubit q;
qubit[3] r;
bit[3] c;
int[32] n = 0;
uint u;
float[64] f = 1.5e-3;
angle[20] a = π / 4;
bool b = true;
complex[float[64]] z = 1.0 + 2.0im;
duration d = 100ns;
stretch s;
bit[4] bits = "0101";

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

(source_file
  (version
    (float_literal))
  (include
    (string))
  (quantum_declaration
    (qubit_type)
    (identifier))
  (quantum_declaration
    (qubit_type
      (designator
        (integer_literal)))
    (identifier))
  (classical_declaration
    (scalar_type
      (designator
        (integer_literal)))
    (identifier))
  (classical_declaration
    (scalar_type
      (designator
        (integer_literal)))
    (identifier)
    (integer_literal))
  (classical_declaration
    (scalar_type)
    (identifier))
  (classical_declaration
    (scalar_type
      (designator
        (integer_literal)))
    (identifier)
    (float_literal))
  (classical_declaration
    (scalar_type
      (designator
        (integer_literal)))
    (identifier)
    (binary_expression
      (identifier)
      (integer_literal)))
  (classical_declaration
    (scalar_type)
    (identifier)
    (boolean_literal))
  (classical_declaration
    (scalar_type
      (scalar_type
        (designator
          (integer_literal))))
    (identifier)
    (binary_expression
      (float_literal)
      (imaginary_literal)))
  (classical_declaration
    (scalar_type)
    (identifier)
    (timing_literal))
  (classical_declaration
    (scalar_type)
    (identifier))
  (classical_declaration
    (scalar_type
      (designator
        (integer_literal)))
    (identifier)
    (string)))

================================================================================
Constants, inputs, outputs, arrays and aliases
================================================================================

input uint n;
input float[64] theta;
output bit[2] result;
const int k = 2 * n + 1;
array[int[8], 3] values = {1, 2, 3};
array[float[32], 2, 2] grid = {{0.5, 1.5}, {2.5, 3.5}};
let pair = q[0:1] ++ r;
let last = q[-1];

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

(source_file
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    (scalar_type)
    (identifier))
  (io_declaration
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      (designator
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    (identifier))
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      (designator
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    (identifier))
  (const_declaration
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    (identifier)
    (binary_expression
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        (integer_literal)
        (identifier))
      (integer_literal)))
  (classical_declaration
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      (scalar_type
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      (integer_literal))
    (identifier)
    (array_literal
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      (integer_literal)
      (integer_literal)))
  (classical_declaration
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      (integer_literal))
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        (float_literal))
      (array_literal
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            (integer_literal))))
      (identifier)))
  (alias_declaration
    (identifier)
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      (index_expression
        (identifier)
        (index
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            (integer_literal)))))))

================================================================================
OpenQASM 2 registers
================================================================================

OPENQASM 2.0;
include "qelib1.inc";
qreg q[3];
creg c[3];

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

(source_file
  (version
    (float_literal))
  (include
    (string))
  (old_style_declaration
    (identifier)
    (designator
      (integer_literal)))
  (old_style_declaration
    (identifier)
    (designator
      (integer_literal))))

================================================================================
Integer literals in every base
================================================================================

uint[8] mask = 0x0F | 0b1010 | 0o17 | 1_000;

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

(source_file
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      (designator
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    (identifier)
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          (integer_literal))
        (integer_literal))
      (integer_literal))))