OpenQASM version:

3.0 (0.4.0)

Python version:

3.11

Operating system:

macOS 13.0 (Ventura)

What is the current behavior?

Parsing a OpenQASM string with arrayType inputs raises an error.

Steps to reproduce the problem

Create a new Conda environment

conda install pip
pip install openqasm3
import openqasm3

qasm_str = """
OPENQASM 3.0;
input array[int, 4] n_steps;
"""
openqasm3.parse(qasm_str)

raises error when processing the last line, in openqasm3/parser.py in visitIODeclarationStatement line
type=self.visit(ctx.scalarType())

What is the expected behavior?
OpenQASM grammar definition shows support for arrayTypes https://github.com/openqasm/openqasm/blob/main/source/grammar/qasm3Parser.g4#L96 but visitIODeclaration only visits scalarType() as mentioned above.
This differs from visitClassicalDeclarationStatement where type does include arrayTypes():
type=self.visit(ctx.scalarType() or ctx.arrayType())

Suggested solutions (Optional)
Adding or ctx.arrayType() to the visit call in visitIODeclarationStatement, similar to the statement in visitClassicalDeclarationStatement