Error parsing a wat file generated by wasm2wat

In the Polkadot Verification repo, we cannot parse a wat file (generated by wasm2wat) which contains the following line:

(module
  (elem (;0;) (i32.const 1) func
    $core::fmt::num::imp::<impl_core::fmt::Display_for_u32>::fmt::ha79246951b68fe80
    $core::fmt::ArgumentV1::show_usize::h9fa3e0fa2697756b
    $<&T_as_core::fmt::Debug>::fmt::hfb4e6e1c0fcf56c0
    $<&T_as_core::fmt::Display>::fmt::h16124ef9ce946986
    $<&T_as_core::fmt::Display>::fmt::h20cb1a1cf15c6d24
    $<core::ops::range::Range<Idx>_as_core::fmt::Debug>::fmt::hb35043a9877a7615
    $<char_as_core::fmt::Debug>::fmt::hef5da4a1a8a279fb
    $<&T_as_core::fmt::Debug>::fmt::h45f63439ed1bcf4b
    $<core::fmt::Arguments_as_core::fmt::Display>::fmt::hd1bbab0340bb1ec7
    $<&T_as_core::fmt::Debug>::fmt::hb97f009bf049e702
    $<&T_as_core::fmt::Debug>::fmt::hdad4d7f77d923220
    $<&T_as_core::fmt::Debug>::fmt::hed0921afd643a9ab
    $<&T_as_core::fmt::Display>::fmt::hd29f630af4e7d945
    $<&T_as_core::fmt::Display>::fmt::h94b083fea96f035d
    $core::ptr::real_drop_in_place::h0d888a1e0a723219
    $<&mut_W_as_core::fmt::Write>::write_str::h1dae3170eae7032e
    $<&mut_W_as_core::fmt::Write>::write_char::hf398abaebb576fef
    $<&mut_W_as_core::fmt::Write>::write_fmt::h432343c9b2aa3d72
    $core::ptr::real_drop_in_place::h087fbcfa01172045
    $<core::fmt::Error_as_core::fmt::Debug>::fmt::h6c3642b0f48bddb7
    $<T_as_core::any::Any>::type_id::h74b0a6610a938729
    $core::ptr::real_drop_in_place::h22b1e96983d394ed
    $<core::fmt::builders::PadAdapter_as_core::fmt::Write>::write_str::h98030c2343020556
    $core::fmt::Write::write_char::he833390620ea7010
    $core::fmt::Write::write_fmt::h26414c5889f666af
    $<&mut_W_as_core::fmt::Write>::write_str::hb15e49880ddc044c
    $<&mut_W_as_core::fmt::Write>::write_char::h75b4860908a7f781
    $<&mut_W_as_core::fmt::Write>::write_fmt::h35f1bf288aae94bb
    $<frame_system::__GetByteStructExtrinsicCount<T>_as_frame_metadata::DefaultByte>::default_byte::h590b0db3c6b449ba
    $<frame_system::__GetByteStructExtrinsicData<T>_as_frame_metadata::DefaultByte>::default_byte::h955b2c0f888864bb
    $<frame_system::__GetByteStructExtrinsicsRoot<T>_as_frame_metadata::DefaultByte>::default_byte::h84a73daae9722e2d
    $<pallet_randomness_collective_flip::__GetByteStructRandomMaterial<T>_as_frame_metadata::DefaultByte>::default_byte::h2d69d021efad6df4
    $<frame_system::__GetByteStructNumber<T>_as_frame_metadata::DefaultByte>::default_byte::hdbe11c8be83cd8fa
    $<pallet_grandpa::__GetByteStructCurrentSetId<T>_as_frame_metadata::DefaultByte>::default_byte::h6f36f28213563d08
    $<pallet_balances::__GetByteStructFreeBalance<T_I>_as_frame_metadata::DefaultByte>::default_byte::h2f66931a5ff7c359
    $<pallet_transaction_payment::Module<T>::module_constants_metadata::TransactionByteFeeDefaultByteGetter<T>_as_frame_metadata::DefaultByte>::default_byte::h583744c90a78d865
    $core::ptr::real_drop_in_place::h4591b5fec6163f10
    $<sp_inherents::Error_as_core::fmt::Debug>::fmt::ha5f9f2ebde354c3d
    $<&T_as_core::fmt::Debug>::fmt::h2d03750a236140d3
    $<pallet_timestamp::Module<T>::module_constants_metadata::MinimumPeriodDefaultByteGetter<T>_as_frame_metadata::DefaultByte>::default_byte::h4bda46306d59c7f1
    $<pallet_balances::Module<T_I>::module_constants_metadata::ExistentialDepositDefaultByteGetter<T_I>_as_frame_metadata::DefaultByte>::default_byte::h94dad39d726e3e64
    $<pallet_grandpa::__GetByteStructState<T>_as_frame_metadata::DefaultByte>::default_byte::hfbecc956d06bc09f
    $<&mut_W_as_core::fmt::Write>::write_str::hf44d9a42cc805d91
    $<&mut_W_as_core::fmt::Write>::write_char::haaefd731da91efbe
    $<&mut_W_as_core::fmt::Write>::write_fmt::h60f7f467d79e8814   $<pallet_sudo::__GetByteStructKey<T>_as_frame_metadata::DefaultByte>::default_byte::hdaa2bf19666c20c8
    $frame_system::Module<T>::storage_metadata::h4ab6418f064d6e14
    $frame_system::Module<T>::call_functions::h8249958767cf1850
    $node_template_runtime::Runtime::__module_events_system::h89aa519d5c3b0998
    $<node_template_runtime::template::Module<T>_as_frame_metadata::ModuleErrorMetadata>::metadata::h28b46e9e2aada3c0
    $<frame_system::Module<T>_as_frame_metadata::ModuleErrorMetadata>::metadata::he35b623a643e9f90
    $pallet_timestamp::Module<T>::storage_metadata::h164597403c936805
    $pallet_timestamp::Module<T>::call_functions::h62d5bce507a13864
    $pallet_timestamp::Module<T>::module_constants_metadata::hfac79a91a0b09a55
    $pallet_grandpa::Module<T>::storage_metadata::h0e4052f883015d1e
    $pallet_grandpa::Module<T>::call_functions::h760c3f8134a147f7
    $node_template_runtime::Runtime::__module_events_grandpa::hee11132fe69b9cfc
    $pallet_indices::Module<T>::storage_metadata::h622e96e100413146
    $node_template_runtime::Runtime::__module_events_indices::h7c1f26c2f6339ddd
    $pallet_balances::Module<T_I>::storage_metadata::h082815e2817e5c19
    $pallet_balances::Module<T_I>::call_functions::h5c8befb10787dea0
    $node_template_runtime::Runtime::__module_events_balances::h98ed251006d93322
    $pallet_balances::Module<T_I>::module_constants_metadata::h487a5f31fed8642e
    $pallet_transaction_payment::Module<T>::storage_metadata::h1355847cc5795baf
    $pallet_transaction_payment::Module<T>::module_constants_metadata::hac56e2f8b747714d
    $pallet_sudo::Module<T>::storage_metadata::hc16b6a8a1cd765e8
    $pallet_sudo::Module<T>::call_functions::hfee628faae0d77da
    $node_template_runtime::Runtime::__module_events_sudo::hd6e1c047a7a3b148
    $node_template_runtime::template::Module<T>::storage_metadata::h008b32b98f124856
    $node_template_runtime::template::Module<T>::call_functions::h9a003a4c8d619b97
    $node_template_runtime::Runtime::__module_events_template::hb10f562ca4c8e4d6
    $pallet_randomness_collective_flip::Module<T>::storage_metadata::h1f7aef9e98d5441e
  )
)

It seems that we must have some deficiency in our grammar if we can't parse something produced by wasm2wat.

Reproduce the failure by submitting the provided wasm2wat output to the repository's WAT parser, then inspect the grammar around the elem segment and function-name tokens. Done means this generated WAT snippet parses successfully without weakening support for existing syntax.