LocalSimulator crash: 'FloatLiteral' object has no attribute 'name' when a classical variable is present with a measurement-conditioned if (default-simulator 1.39.5)

[AJ-comp]

Summary

On the latest amazon-braket-default-simulator (1.39.5), a valid OpenQASM 3 program crashes with an
internal AttributeError: 'FloatLiteral' object has no attribute 'name' when it combines a classical
scalar variable with a measurement-dependent if. The program parses cleanly (see Validity below); the
crash happens during execution.

Reproduction (crashes)

from braket.devices import LocalSimulator
from braket.ir.openqasm import Program

qasm = """
OPENQASM 3;
include "stdgates.inc";
qubit[1] q;
bit c;
float a = 3.14159265;
c = measure q[0];
if (c == false) { }
rx(a) q[0];
"""
LocalSimulator().run(Program(source=qasm), shots=10).result()

AttributeError: 'FloatLiteral' object has no attribute 'name'

It runs fine without the classical variable

Dropping float a and using a literal angle -- rx(3.14159265) q[0]; -- runs fine, as does removing the
if. The crash needs both a classical scalar variable and a measurement-conditioned branch. It is
not specific to angles: int a = 3; c = measure q[0]; if (c == false) { } x q[0]; crashes the same way
('IntegerLiteral' object has no attribute 'name') -- an unused scalar + a measurement branch + any
following gate is enough. (angle gives 'SymbolLiteral' object has no attribute 'name'.)

Validity (this is a valid program, not a syntax error)

The program parses cleanly with both the reference parser and Braket's own parser, so this is not a
malformed-input rejection:

import openqasm3
openqasm3.parse(qasm)                                    # OK: 7-statement Program AST, round-trips

from braket.default_simulator.openqasm import interpreter
interpreter.parse(qasm)                                  # OK: Program AST, 7 statements

The AttributeError is raised later, during execution (the interpreter visit), not at parse time.

Traceback (key frames)

.../braket/default_simulator/openqasm/interpreter.py", line 452, in _
    [self.context.qubit_mapping.get_qubit_size(qubit) for qubit in qubits]
.../braket/default_simulator/openqasm/program_context.py", line 184, in get_qubit_size
    return len(self.get_by_identifier(identifier))
.../braket/default_simulator/openqasm/program_context.py", line 140, in get_by_identifier
    if identifier.name.startswith("$"):
AttributeError: 'FloatLiteral' object has no attribute 'name'

On the measurement-branched execution path, the gate's qubit resolution appears to receive the classical
value (a FloatLiteral / IntegerLiteral / SymbolLiteral) where a qubit Identifier is expected.

Expected

The program should simulate. A classical variable together with a measurement-conditioned if is valid
OpenQASM 3, so it should not raise an internal AttributeError.

Environment

• amazon-braket-default-simulator 1.39.5 (latest on PyPI, 2026-06-22)
• amazon-braket-sdk 1.121.0 - amazon-braket-schemas 1.31.0 - openqasm3 1.0.1 - antlr4-python3-runtime 4.13.2
• Python 3.12.9 - Windows 11 - device: LocalSimulator() (StateVectorSimulator)