QasmParser throws Syntax-Error

[lasys]

Description of the issue

QasmParser cannot parse Qasm-code.
Is there an error in my Qasm-code or a bug in the QasmParser?
Thanks for your help!

How to reproduce the issue

I convert my circuit from Qiskit to Qasm, which gives the following results:

OPENQASM 2.0;

include "qelib1.inc";

gate QAOA(param0,param1) q0,q1,q2,q3,q4 { h q0; h q1; h q2; h q3; h q4; cx q3,q0; rz(0.4) q0; cx q3,q0; cx q4,q0; rz(0.4) q0; cx q4,q0; cx q2,q1; rz(0.4) q1; cx q2,q1; cx q4,q1; rz(0.4) q1; cx q4,q1; cx q4,q2; rz(0.4) q2; cx q4,q2; cx q4,q3; rz(0.4) q3; cx q4,q3; rx(0.2) q0; rx(0.2) q1; rx(0.2) q2; rx(0.2) q3; rx(0.2) q4; }

qreg q[5];

QAOA(0.4,0.1) q[0],q[1],q[2],q[3],q[4];

Now I would like to create a Cirq circuit using the QasmParser from Cirq (https://github.com/quantumlib/Cirq/blob/master/cirq-core/cirq/contrib/qasm_import/qasm.py), but i get this Syntax Error Message:

~/.local/lib/python3.8/site-packages/cirq/contrib/qasm_import/qasm.py in circuit_from_qasm(qasm)
     28 
---> 29     return QasmParser().parse(qasm).circuit

~/.local/lib/python3.8/site-packages/cirq/contrib/qasm_import/_parser.py in parse(self, qasm)
    518             self.lexer.input(self.qasm)
--> 519             self.parsedQasm = self.parser.parse(lexer=self.lexer)
    520         return self.parsedQasm

~/.local/lib/python3.8/site-packages/ply/yacc.py in parse(self, input, lexer, debug, tracking, tokenfunc)
    332         else:
--> 333             return self.parseopt_notrack(input, lexer, debug, tracking, tokenfunc)
    334 

~/.local/lib/python3.8/site-packages/ply/yacc.py in parseopt_notrack(self, input, lexer, debug, tracking, tokenfunc)
   1200                         self.state = state
-> 1201                         tok = call_errorfunc(self.errorfunc, errtoken, self)
   1202                         if self.errorok:

~/.local/lib/python3.8/site-packages/ply/yacc.py in call_errorfunc(errorfunc, token, parser)
    191     _restart = parser.restart
--> 192     r = errorfunc(token)
    193     try:

~/.local/lib/python3.8/site-packages/cirq/contrib/qasm_import/_parser.py in p_error(self, p)
    499 
--> 500         raise QasmException(
    501             """Syntax error: '{}'

QasmException: Syntax error: '('
... QAOA(param0,param1) q0,q1,q2,q3,q4 { h q0; h q1; h q2; h q3; h q4; cx q3,q0; rz(0.4) q0; cx q3,q0; cx q4,q0; rz(0.4) q0; cx q4,q0; cx q2,q1; rz(0.4) q1; cx q2,q1; cx q4,q1; rz(0.4) q1; cx q4,q1; cx q4,q2; rz(0.4) q2; cx q4,q2; cx q4,q3; rz(0.4) q3; cx q4,q3; rx(0.2) q0; rx(0.2) q1; rx(0.2) q2; rx(0.2) q3; rx(0.2) q4; }
qreg q[5];
QAOA(0.4,0.1) q[0],q[1],q[2],q[3],q[4]
        ^
at line 3, column 10

Removing the parameters of QAOA-Gate ends in a Syntax-Error, too.
When i remove the custom gate and insert this into the parser everything works fine.

OPENQASM 2.0;

include "qelib1.inc";

qreg q[5];

h q[0]; h q[1]; h q[2]; h q[3]; h q[4]; cx q[3],q[0]; rz(0.4) q[0]; cx q[3],q[0]; cx q[4],q[0]; rz(0.4) q[0]; cx q[4],q[0]; cx q[2],q[1]; rz(0.4) q[1]; cx q[2],q[1]; cx q[4],q[1]; rz(0.4) q[1]; cx q[4],q[1]; cx q[4],q[2]; rz(0.4) q[2]; cx q[4],q[2]; cx q[4],q[3]; rz(0.4) q[3]; cx q[4],q[3]; rx(0.2) q[0]; rx(0.2) q[1]; rx(0.2) q[2]; rx(0.2) q[3]; rx(0.2) q[4];

Cirq version
You can get the cirq version by printing cirq.__version__. From the command line:

0.10.0

[vtomole]

QasmParser doesn't support the ability to define custom gates yet. See #3560. Please feel free to look into adding this if you'd like.

[lasys]

Alright.
I found a workaround that rewrites the Qasm-String without Custom Gates and finally can be parsed.
Thanks!