diff --git a/.github/workflows/test-lock.yml b/.github/workflows/test-lock.yml
index 18c56aa..4c2237e 100644
--- a/.github/workflows/test-lock.yml
+++ b/.github/workflows/test-lock.yml
@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest ]
-        python-version: [ "3.7", "3.8", "3.9", "3.10", "3.11" ]
+        python-version: [ "3.8", "3.9", "3.10", "3.11" ]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Check out OQpy
@@ -23,7 +23,7 @@ jobs:
 
       - name: Install poetry
         run: |
-          make install-poetry
+          make install-poetry poetry_version=1.5.1
           poetry --version
           poetry config virtualenvs.in-project true
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8409752..b214090 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest ]
-        python-version: [ "3.7", "3.8", "3.9", "3.10", "3.11" ]
+        python-version: [ "3.8", "3.9", "3.10", "3.11" ]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Check out OQpy
@@ -79,7 +79,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest ]
-        python-version: [ "3.7", "3.8", "3.9", "3.10", "3.11" ]
+        python-version: [ "3.8", "3.9", "3.10", "3.11" ]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Check out OQpy
@@ -93,7 +93,7 @@ jobs:
 
       - name: Install poetry
         run: |
-          make install-poetry
+          make install-poetry poetry_version=1.5.1
           poetry --version
           poetry config virtualenvs.in-project true
 
diff --git a/Makefile b/Makefile
index 8382491..fd88270 100644
--- a/Makefile
+++ b/Makefile
@@ -46,4 +46,4 @@ check-citation:
 .PHONY: install-poetry
 install-poetry:
 	command -v curl >/dev/null 2>&1 || { echo >&2 "please install curl and retry."; exit 1; }
-	curl -sSL https://install.python-poetry.org | python -
+	curl -sSL https://install.python-poetry.org | POETRY_VERSION=$(poetry_version) python -
diff --git a/oqpy/base.py b/oqpy/base.py
index ca8a944..8d59b21 100644
--- a/oqpy/base.py
+++ b/oqpy/base.py
@@ -22,20 +22,23 @@
 from __future__ import annotations
 
 import math
-import sys
 from abc import ABC, abstractmethod
-from typing import TYPE_CHECKING, Any, Iterable, Optional, Sequence, Union
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Iterable,
+    Optional,
+    Protocol,
+    Sequence,
+    Union,
+    runtime_checkable,
+)
 
 import numpy as np
 from openpulse import ast
 
 from oqpy import classical_types
 
-if sys.version_info >= (3, 8):
-    from typing import Protocol, runtime_checkable
-else:
-    from typing_extensions import Protocol, runtime_checkable
-
 if TYPE_CHECKING:
     from oqpy import Program
 
diff --git a/oqpy/classical_types.py b/oqpy/classical_types.py
index 9e2d042..8302397 100644
--- a/oqpy/classical_types.py
+++ b/oqpy/classical_types.py
@@ -62,7 +62,6 @@
     "ComplexVar",
     "DurationVar",
     "OQFunctionCall",
-    "OQIndexExpression",
     "StretchVar",
     "_ClassicalVar",
     "duration",
@@ -236,6 +235,25 @@ def __init__(self, *args: Any, size: int | None = None, **kwargs: Any):
             self.size = size
         super().__init__(*args, **kwargs, size=ast.IntegerLiteral(self.size) if self.size else None)
 
+    def _validate_getitem_index(self, index: AstConvertible) -> None:
+        """Validate the index and variable for `__getitem__`.
+
+        Args:
+            var (_SizedVar): Variable to apply `__getitem__`.
+            index (AstConvertible): Index for `__getitem__`.
+        """
+        if self.size is None:
+            raise TypeError(f"'{self.name}' is not subscriptable")
+
+        if isinstance(index, int):
+            if not 0 <= index < self.size:
+                raise IndexError("list index out of range.")
+        elif isinstance(index, OQPyExpression):
+            if not isinstance(index.type, (ast.IntType, ast.UintType)):
+                raise IndexError("The list index must be an integer.")
+        else:
+            raise IndexError("The list index must be an integer.")
+
 
 _SizedVarT = TypeVar("_SizedVarT", bound=_SizedVar)
 
@@ -274,7 +292,8 @@ class BitVar(_SizedVar):
     type_cls = ast.BitType
 
     def __getitem__(self, index: AstConvertible) -> OQIndexExpression:
-        return OQIndexExpression(collection=self, index=index)
+        self._validate_getitem_index(index)
+        return OQIndexExpression(collection=self, index=index, type_=self.type_cls())
 
 
 class ComplexVar(_ClassicalVar):
@@ -380,31 +399,16 @@ def __init__(
         )
 
     def __getitem__(self, index: AstConvertible) -> OQIndexExpression:
-        return OQIndexExpression(collection=self, index=index)
+        return OQIndexExpression(collection=self, index=index, type_=self.base_type().type_cls())
 
 
 class OQIndexExpression(OQPyExpression):
     """An oqpy expression corresponding to an index expression."""
 
-    def __init__(self, collection: AstConvertible, index: AstConvertible):
+    def __init__(self, collection: AstConvertible, index: AstConvertible, type_: ast.ClassicalType):
         self.collection = collection
         self.index = index
-
-        if isinstance(collection, ArrayVar):
-            self.type = collection.base_type().type_cls()
-
-        if isinstance(collection, _SizedVar):
-            if collection.size is None:
-                raise TypeError(f"'{collection.type_cls}' object is not subscriptable")
-
-            if isinstance(self.index, int):
-                if not 0 <= self.index < collection.size:
-                    raise IndexError("list index out of range.")
-            elif isinstance(self.index, OQPyExpression):
-                if not isinstance(self.index.type, (ast.IntType, ast.UintType)):
-                    raise IndexError("The list index must be an integer.")
-            else:
-                raise IndexError("The list index must be an integer.")
+        self.type = type_
 
     def to_ast(self, program: Program) -> ast.IndexExpression:
         """Converts this oqpy index expression into an ast node."""
diff --git a/oqpy/program.py b/oqpy/program.py
index 3a4a87e..4985e96 100644
--- a/oqpy/program.py
+++ b/oqpy/program.py
@@ -483,7 +483,7 @@ def gate(
         self, qubits: AstConvertible | Iterable[AstConvertible], name: str, *args: Any
     ) -> Program:
         """Apply a gate to a qubit or set of qubits."""
-        if isinstance(qubits, quantum_types.Qubit):
+        if isinstance(qubits, (quantum_types.Qubit, quantum_types.IndexedQubitArray)):
             qubits = [qubits]
         assert isinstance(qubits, Iterable)
         self._add_statement(
@@ -523,6 +523,14 @@ def pragma(self, command: str) -> Program:
         self._add_statement(ast.Pragma(command))
         return self
 
+    def include(self, path: str) -> Program:
+        """Add an include statement."""
+        if len(self.stack) != 1:
+            # cf. https://openqasm.com/language/comments.html#included-files
+            raise RuntimeError("Include statements must be global")
+        self._add_statement(ast.Include(path))
+        return self
+
     def _do_assignment(self, var: AstConvertible, op: str, value: AstConvertible) -> None:
         """Helper function for variable assignment operations."""
         if isinstance(var, classical_types.DurationVar):
diff --git a/oqpy/quantum_types.py b/oqpy/quantum_types.py
index 537c559..cf5a181 100644
--- a/oqpy/quantum_types.py
+++ b/oqpy/quantum_types.py
@@ -30,7 +30,7 @@
     from oqpy.program import Program
 
 
-__all__ = ["Qubit", "QubitArray", "defcal", "gate", "PhysicalQubits", "Cal"]
+__all__ = ["Qubit", "defcal", "gate", "PhysicalQubits", "Cal"]
 
 
 class Qubit(Var):
@@ -39,11 +39,13 @@ class Qubit(Var):
     def __init__(
         self,
         name: str,
+        size: Optional[int] = None,
         needs_declaration: bool = True,
         annotations: Sequence[str | tuple[str, str]] = (),
     ):
         super().__init__(name, needs_declaration=needs_declaration)
         self.name = name
+        self.size = size
         self.annotations = annotations
 
     def to_ast(self, prog: Program) -> ast.Expression:
@@ -53,10 +55,18 @@ def to_ast(self, prog: Program) -> ast.Expression:
 
     def make_declaration_statement(self, program: Program) -> ast.Statement:
         """Make an ast statement that declares the OQpy variable."""
-        decl = ast.QubitDeclaration(ast.Identifier(self.name), size=None)
+        decl = ast.QubitDeclaration(
+            ast.Identifier(self.name),
+            size=ast.IntegerLiteral(self.size) if self.size else self.size,
+        )
         decl.annotations = make_annotations(self.annotations)
         return decl
 
+    def __getitem__(self, index: AstConvertible) -> IndexedQubitArray:
+        if self.size is None:
+            raise TypeError(f"'{self.name}' is not subscriptable")
+        return IndexedQubitArray(collection=self, index=index)
+
 
 class PhysicalQubits:
     """Provides a means of accessing qubit variables corresponding to physical qubits.
@@ -68,9 +78,18 @@ def __class_getitem__(cls, item: int) -> Qubit:
         return Qubit(f"${item}", needs_declaration=False)
 
 
-# Todo (#51): support QubitArray
-class QubitArray:
-    """Represents an array of qubits."""
+class IndexedQubitArray:
+    """Represents an indexed qubit array."""
+
+    def __init__(self, collection: Qubit, index: AstConvertible):
+        self.collection = collection
+        self.index = index
+
+    def to_ast(self, program: Program) -> ast.IndexExpression:
+        """Converts this indexed qubit array into an ast node."""
+        return ast.IndexExpression(
+            collection=to_ast(program, self.collection), index=[to_ast(program, self.index)]
+        )
 
 
 @contextlib.contextmanager
diff --git a/poetry.lock b/poetry.lock
index 9f6f32d..9778649 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -22,24 +22,6 @@ files = [
     {file = "antlr4_python3_runtime-4.11.1-py3-none-any.whl", hash = "sha256:ff1954eda1ca9072c02bf500387d0c86cb549bef4dbb3b64f39468b547ec5f6b"},
 ]
 
-[[package]]
-name = "astroid"
-version = "2.11.5"
-description = "An abstract syntax tree for Python with inference support."
-optional = false
-python-versions = ">=3.6.2"
-files = [
-    {file = "astroid-2.11.5-py3-none-any.whl", hash = "sha256:14ffbb4f6aa2cf474a0834014005487f7ecd8924996083ab411e7fa0b508ce0b"},
-    {file = "astroid-2.11.5.tar.gz", hash = "sha256:f4e4ec5294c4b07ac38bab9ca5ddd3914d4bf46f9006eb5c0ae755755061044e"},
-]
-
-[package.dependencies]
-lazy-object-proxy = ">=1.4.0"
-setuptools = ">=20.0"
-typed-ast = {version = ">=1.4.0,<2.0", markers = "implementation_name == \"cpython\" and python_version < \"3.8\""}
-typing-extensions = {version = ">=3.10", markers = "python_version < \"3.10\""}
-wrapt = ">=1.11,<2"
-
 [[package]]
 name = "astroid"
 version = "2.12.13"
@@ -53,7 +35,6 @@ files = [
 
 [package.dependencies]
 lazy-object-proxy = ">=1.4.0"
-typed-ast = {version = ">=1.4.0,<2.0", markers = "implementation_name == \"cpython\" and python_version < \"3.8\""}
 typing-extensions = {version = ">=3.10", markers = "python_version < \"3.10\""}
 wrapt = [
     {version = ">=1.11,<2", markers = "python_version < \"3.11\""},
@@ -127,7 +108,6 @@ mypy-extensions = ">=0.4.3"
 pathspec = ">=0.9.0"
 platformdirs = ">=2"
 tomli = {version = ">=1.1.0", markers = "python_full_version < \"3.11.0a7\""}
-typed-ast = {version = ">=1.4.2", markers = "python_version < \"3.8\" and implementation_name == \"cpython\""}
 typing-extensions = {version = ">=3.10.0.0", markers = "python_version < \"3.10\""}
 
 [package.extras]
@@ -157,13 +137,13 @@ dev = ["Sphinx (==4.3.2)", "black (==22.3.0)", "build (==0.8.0)", "flake8 (==4.0
 
 [[package]]
 name = "certifi"
-version = "2023.5.7"
+version = "2023.7.22"
 description = "Python package for providing Mozilla's CA Bundle."
 optional = false
 python-versions = ">=3.6"
 files = [
-    {file = "certifi-2023.5.7-py3-none-any.whl", hash = "sha256:c6c2e98f5c7869efca1f8916fed228dd91539f9f1b444c314c06eef02980c716"},
-    {file = "certifi-2023.5.7.tar.gz", hash = "sha256:0f0d56dc5a6ad56fd4ba36484d6cc34451e1c6548c61daad8c320169f91eddc7"},
+    {file = "certifi-2023.7.22-py3-none-any.whl", hash = "sha256:92d6037539857d8206b8f6ae472e8b77db8058fec5937a1ef3f54304089edbb9"},
+    {file = "certifi-2023.7.22.tar.gz", hash = "sha256:539cc1d13202e33ca466e88b2807e29f4c13049d6d87031a3c110744495cb082"},
 ]
 
 [[package]]
@@ -292,7 +272,6 @@ files = [
 
 [package.dependencies]
 colorama = {version = "*", markers = "platform_system == \"Windows\""}
-importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 
 [[package]]
 name = "colorama"
@@ -386,34 +365,34 @@ toml = ["tomli"]
 
 [[package]]
 name = "cryptography"
-version = "41.0.2"
+version = "41.0.3"
 description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers."
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "cryptography-41.0.2-cp37-abi3-macosx_10_12_universal2.whl", hash = "sha256:01f1d9e537f9a15b037d5d9ee442b8c22e3ae11ce65ea1f3316a41c78756b711"},
-    {file = "cryptography-41.0.2-cp37-abi3-macosx_10_12_x86_64.whl", hash = "sha256:079347de771f9282fbfe0e0236c716686950c19dee1b76240ab09ce1624d76d7"},
-    {file = "cryptography-41.0.2-cp37-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:439c3cc4c0d42fa999b83ded80a9a1fb54d53c58d6e59234cfe97f241e6c781d"},
-    {file = "cryptography-41.0.2-cp37-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:f14ad275364c8b4e525d018f6716537ae7b6d369c094805cae45300847e0894f"},
-    {file = "cryptography-41.0.2-cp37-abi3-manylinux_2_28_aarch64.whl", hash = "sha256:84609ade00a6ec59a89729e87a503c6e36af98ddcd566d5f3be52e29ba993182"},
-    {file = "cryptography-41.0.2-cp37-abi3-manylinux_2_28_x86_64.whl", hash = "sha256:49c3222bb8f8e800aead2e376cbef687bc9e3cb9b58b29a261210456a7783d83"},
-    {file = "cryptography-41.0.2-cp37-abi3-musllinux_1_1_aarch64.whl", hash = "sha256:d73f419a56d74fef257955f51b18d046f3506270a5fd2ac5febbfa259d6c0fa5"},
-    {file = "cryptography-41.0.2-cp37-abi3-musllinux_1_1_x86_64.whl", hash = "sha256:2a034bf7d9ca894720f2ec1d8b7b5832d7e363571828037f9e0c4f18c1b58a58"},
-    {file = "cryptography-41.0.2-cp37-abi3-win32.whl", hash = "sha256:d124682c7a23c9764e54ca9ab5b308b14b18eba02722b8659fb238546de83a76"},
-    {file = "cryptography-41.0.2-cp37-abi3-win_amd64.whl", hash = "sha256:9c3fe6534d59d071ee82081ca3d71eed3210f76ebd0361798c74abc2bcf347d4"},
-    {file = "cryptography-41.0.2-pp310-pypy310_pp73-macosx_10_12_x86_64.whl", hash = "sha256:a719399b99377b218dac6cf547b6ec54e6ef20207b6165126a280b0ce97e0d2a"},
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-    {file = "cryptography-41.0.2.tar.gz", hash = "sha256:7d230bf856164de164ecb615ccc14c7fc6de6906ddd5b491f3af90d3514c925c"},
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 ]
 
 [package.dependencies]
@@ -512,7 +491,6 @@ files = [
 ]
 
 [package.dependencies]
-typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
@@ -593,7 +571,6 @@ files = [
 
 [package.dependencies]
 attrs = ">=17.4.0"
-importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 pyrsistent = ">=0.14.0"
 setuptools = "*"
 six = ">=1.11.0"
@@ -682,7 +659,6 @@ files = [
 
 [package.dependencies]
 mdurl = ">=0.1,<1.0"
-typing_extensions = {version = ">=3.7.4", markers = "python_version < \"3.8\""}
 
 [package.extras]
 benchmarking = ["psutil", "pytest", "pytest-benchmark"]
@@ -822,7 +798,6 @@ files = [
 [package.dependencies]
 mypy-extensions = ">=1.0.0"
 tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
-typed-ast = {version = ">=1.4.0,<2", markers = "python_version < \"3.8\""}
 typing-extensions = ">=4.1.0"
 
 [package.extras]
@@ -868,46 +843,6 @@ linkify = ["linkify-it-py (>=1.0,<2.0)"]
 rtd = ["ipython", "sphinx-book-theme", "sphinx-design", "sphinxcontrib.mermaid (>=0.7.1,<0.8.0)", "sphinxext-opengraph (>=0.6.3,<0.7.0)", "sphinxext-rediraffe (>=0.2.7,<0.3.0)"]
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-[[package]]
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-python-versions = ">=3.7,<3.11"
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-]
-
 [[package]]
 name = "numpy"
 version = "1.23.4"
@@ -977,7 +912,6 @@ files = [
 ]
 
 [package.dependencies]
-importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 Pygments = ">=2.0,<3.0"
 
 [[package]]
@@ -1065,9 +999,6 @@ files = [
     {file = "pluggy-1.0.0.tar.gz", hash = "sha256:4224373bacce55f955a878bf9cfa763c1e360858e330072059e10bad68531159"},
 ]
 
-[package.dependencies]
-importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
-
 [package.extras]
 dev = ["pre-commit", "tox"]
 testing = ["pytest", "pytest-benchmark"]
@@ -1112,15 +1043,18 @@ toml = ["toml"]
 
 [[package]]
 name = "pygments"
-version = "2.12.0"
+version = "2.16.1"
 description = "Pygments is a syntax highlighting package written in Python."
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
 files = [
-    {file = "Pygments-2.12.0-py3-none-any.whl", hash = "sha256:dc9c10fb40944260f6ed4c688ece0cd2048414940f1cea51b8b226318411c519"},
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+    {file = "Pygments-2.16.1-py3-none-any.whl", hash = "sha256:13fc09fa63bc8d8671a6d247e1eb303c4b343eaee81d861f3404db2935653692"},
+    {file = "Pygments-2.16.1.tar.gz", hash = "sha256:1daff0494820c69bc8941e407aa20f577374ee88364ee10a98fdbe0aece96e29"},
 ]
 
+[package.extras]
+plugins = ["importlib-metadata"]
+
 [[package]]
 name = "pykwalify"
 version = "1.8.0"
@@ -1137,30 +1071,6 @@ docopt = ">=0.6.2"
 python-dateutil = ">=2.8.0"
 "ruamel.yaml" = ">=0.16.0"
 
-[[package]]
-name = "pylint"
-version = "2.13.9"
-description = "python code static checker"
-optional = false
-python-versions = ">=3.6.2"
-files = [
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-]
-
-[package.dependencies]
-astroid = ">=2.11.5,<=2.12.0-dev0"
-colorama = {version = "*", markers = "sys_platform == \"win32\""}
-dill = ">=0.2"
-isort = ">=4.2.5,<6"
-mccabe = ">=0.6,<0.8"
-platformdirs = ">=2.2.0"
-tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
-typing-extensions = {version = ">=3.10.0", markers = "python_version < \"3.10\""}
-
-[package.extras]
-testutil = ["gitpython (>3)"]
-
 [[package]]
 name = "pylint"
 version = "2.15.6"
@@ -1246,7 +1156,6 @@ files = [
 [package.dependencies]
 colorama = {version = "*", markers = "sys_platform == \"win32\""}
 exceptiongroup = {version = ">=1.0.0rc8", markers = "python_version < \"3.11\""}
-importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 iniconfig = "*"
 packaging = "*"
 pluggy = ">=0.12,<2.0"
@@ -1779,39 +1688,6 @@ rfc3986 = ">=1.4.0"
 rich = ">=12.0.0"
 urllib3 = ">=1.26.0"
 
-[[package]]
-name = "typed-ast"
-version = "1.5.4"
-description = "a fork of Python 2 and 3 ast modules with type comment support"
-optional = false
-python-versions = ">=3.6"
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-]
-
 [[package]]
 name = "typing-extensions"
 version = "4.4.0"
@@ -1940,5 +1816,5 @@ testing = ["func-timeout", "jaraco.itertools", "pytest (>=6)", "pytest-black (>=
 
 [metadata]
 lock-version = "2.0"
-python-versions = ">=3.7,<4.0"
-content-hash = "aee4d46ad52fd245ef2091dcc7d8efcd133cc9ef35d2fbe9f7ece7fff5464b6d"
+python-versions = ">=3.8,<4.0"
+content-hash = "ed55efa05b5ab05a056841ae30e76a5a6743bf6a4c4ef16e76b3541d6809b835"
diff --git a/pyproject.toml b/pyproject.toml
index 1591835..c9c8080 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,11 +15,10 @@ classifiers = [
 ]
 
 [tool.poetry.dependencies]
-python = ">=3.7,<4.0"
+python = ">=3.8,<4.0"
 # 0.4 loosens the antlr4-python3-runtime constraints
 openpulse = ">=0.5.0"
 numpy = [
-    {version = ">=1.14.5", python = ">=3.7,<3.8"},
     {version = ">=1.17.3", python = ">=3.8,<3.9"},
     {version = ">=1.19.3", python = ">=3.9,<3.10"},
     {version = ">=1.21.6", python = ">=3.10,<3.11"},
@@ -27,16 +26,13 @@ numpy = [
 ]
 # 0.2 contains VarArg
 mypy-extensions = ">=0.2.0"
-# 3.10 contains Protocol and runtime_checkable
-typing-extensions = {version = ">=3.10.0.2", python = "<3.8"}
 
 [tool.poetry.group.dev.dependencies]
 pytest = "^7.2"
 # 22.8.0 adds py311 support
 black = "^22.8.0"
 pylint = [
-    {version = "<2.14", python = ">=3.7,<3.7.2"},
-    {version = ">=2.14", python = ">=3.7.2,<3.11"},
+    {version = ">=2.14", python = ">=3.8,<3.11"},
     {version = ">=2.15", python = ">=3.11"}
 ]
 mypy = "^1.0.0"
diff --git a/tests/test_directives.py b/tests/test_directives.py
index a50d299..7b71038 100644
--- a/tests/test_directives.py
+++ b/tests/test_directives.py
@@ -2261,3 +2261,42 @@ def test_gate_declarations():
     ).strip()
 
     assert prog.to_qasm() == expected
+
+
+def test_include():
+    prog = Program()
+    prog.include("foo.qasm")
+    prog.declare(IntVar(0, "i"))
+
+    expected = textwrap.dedent(
+        """
+        OPENQASM 3.0;
+        include "foo.qasm";
+        int[32] i = 0;
+        """
+    ).strip()
+
+    assert prog.to_qasm() == expected
+
+
+def test_qubit_array():
+    prog = oqpy.Program()
+    q = oqpy.Qubit("q", size=2)
+    prog.gate(q[0], "h")
+    prog.gate([q[0], q[1]], "cnot")
+
+    expected = textwrap.dedent(
+        """
+        OPENQASM 3.0;
+        qubit[2] q;
+        h q[0];
+        cnot q[0], q[1];
+        """
+    ).strip()
+
+    assert prog.to_qasm() == expected
+
+    with pytest.raises(TypeError):
+        prog = oqpy.Program()
+        q = oqpy.Qubit("q")
+        prog.gate(q[0], "h")