Compiler freezes when compiling nested array logic.

[troels-im]

Describe the bug

Compiler freezes (i.e. takes longer than is reasonable to wait) when compiling nested array logic.

To Reproduce

The issue is reproduced with following snippet:

namespace QATSample {
    open Microsoft.Quantum.Intrinsic;

    @EntryPoint()
    operation Main(): Result
    {

        use qubits = Qubit[10];
        let xx = [[[[[[[[[[[[ [qubits, qubits] ]]]]]]]]]]]];
        
        CNOT(xx[0][0][0][0][0][0][0][0][0][0][0][0][Length(xx[0][0][0][0][0][0][0][0][0][0][0][0]) -1][Length(xx[0][0][0][0][0][0][0][0][0][0][0][0][Length(xx[0][0][0][0][0][0][0][0][0][0][0][0]) - 1]) - 1], q);            

        return Zero;
    }
}

and

<Project Sdk="Microsoft.Quantum.Sdk/0.24.41975-alpha">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0</TargetFramework>
    <IncludeProviderPackages>False</IncludeProviderPackages>
    <ExecutionTarget>qci.qpu</ExecutionTarget>
    <TargetCapability>AdaptiveExecution</TargetCapability>
    <QirGeneration>true</QirGeneration>    
  </PropertyGroup>

</Project>

Expected behavior

That the compiler finishes timely or produces an error message explaining why it cannot finish.

System information

• NuGet Version: 5.9.0.7134
• Darwin MacBook Pro 21.4.0 Darwin Kernel Version 21.4.0: Fri Mar 18 00:45:05 PDT 2022; root:xnu-8020.101.4~15/RELEASE_X86_64 x86_64 and net6.0