(command.CommandList
  children: [
    (command.ShFunction
      name: check
      body: 
        (BraceGroup
          children: [
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (C {<grep>} {<-q>} {(DQ ($ Id.VSub_Number '$2'))} {(DQ ($ Id.VSub_Number '$1'))})
                      ]
                    )
                  action: [
                    (C {<echo>} {(DQ <'Garbage collection failed to collect tls variable:'>)})
                    (C {<echo>} {(DQ <'   '> ($ Id.VSub_Number '$2'))})
                    (command.ControlFlow
                      token: <Id.ControlFlow_Exit exit>
                      arg_word: {<1>}
                    )
                  ]
                  spids: [72 87]
                )
              ]
            )
          ]
        )
    )
    (C {<check>} {<gc_tls_test.stdout>} {(DQ <number>)})
  ]
)