'Solang - panicked at 'type not allowed'

I am trying to get an Ethereum smart contract up and running for Solana. I'm using solang and it had a few issues that I was able to fix, like Solidity's assembly not working, but I finally ran into something I can't handle.

I run solang build: solang ./lib/FastEcMul.sol --target solana --output build and I get:

thread 'main' panicked at 'type not allowed', src/sema/types.rs:920:18

more detailed, with RUST_BACKTRACE=1 and -v:

info: Solang version v0.1.10
thread 'main' panicked at 'type not allowed', src/sema/types.rs:920:18
stack backtrace:
   0:        0x104833ce8 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h8483effd3e9ec544
   1:        0x10433e7e8 - core::fmt::write::ha34752bcd39bca36
   2:        0x1048327d0 - std::io::Write::write_fmt::hfc57a6e48a9ddae2
   3:        0x104832f98 - std::panicking::default_hook::{{closure}}::he9aaba83dd453f35
   4:        0x10483244c - std::panicking::rust_panic_with_hook::hf890018b6cf19ef5
   5:        0x10484f6e0 - std::panicking::begin_panic_handler::{{closure}}::hc0918e64b5d68f06
   6:        0x10484f668 - std::sys_common::backtrace::__rust_end_short_backtrace::hb99d925d54d4af60
   7:        0x10484f634 - _rust_begin_unwind
   8:        0x105b17e38 - core::panicking::panic_fmt::hf9e85df46ac02a7d
   9:        0x10449be1c - solang::sema::types::<impl solang::sema::ast::Type>::bits::h29f3c107ab9657a4
  10:        0x1045df378 - solang::sema::expression::bigint_to_expression::hc02ea43f3e21887f
  11:        0x1045f57bc - solang::sema::expression::power::ha1372353023ad777
  12:        0x1045e9078 - solang::sema::expression::expression::h07d54b6ce13d6489
  13:        0x1045f9ee0 - solang::sema::expression::subtract::hc24c7a4700f0e8e1
  14:        0x1045e8748 - solang::sema::expression::expression::h07d54b6ce13d6489
  15:        0x1045fba34 - solang::sema::expression::bitwise_and::hc24720f8c53e5be3
  16:        0x1045e8574 - solang::sema::expression::expression::h07d54b6ce13d6489
  17:        0x1045a22b4 - solang::sema::statements::destructure_values::h1d04cc668cdbf5fd
  18:        0x1045a13d0 - solang::sema::statements::destructure::h3937764899bb6c4d
  19:        0x104596968 - solang::sema::statements::statement::h392fdbc69b4da93d
  20:        0x10459568c - solang::sema::statements::statement::h392fdbc69b4da93d
  21:        0x104594868 - solang::sema::statements::resolve_function_body::hc7bc7aac8f20f106
  22:        0x10443518c - solang::sema::contracts::resolve::h4024bf7abc2ae716
  23:        0x10447a5e8 - solang::sema::sema_file::h3b89ac6a8acdaddb
  24:        0x10447c83c - solang::parse_and_resolve::hdc70bef828872f55
  25:        0x1047bb45c - solang::main::h5ce247c5504216e2
  26:        0x104799d24 - std::sys_common::backtrace::__rust_begin_short_backtrace::hb58d66c82bbbcc6f
  27:        0x1047b70a0 - _main

I got no idea, which type is not allowed, or where to find the file src/sema/types.rs:920:18.

However, I managed to compile other .sol file EC.sol, on which the FastEcMul.so is dependent. Yet the result was only bundle.so and .abi file is missing.

link to both files

I'd be grateful for any clue.

Solution 1:^[1]

I've started looking at this issue. The first issue I can across was the doccomments which were not supported: https://github.com/hyperledger-labs/solang/pull/756

I'll continue looking at the next issue and get back.

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Solution	Source
Solution 1	Sean Young

'Solang - panicked at 'type not allowed'

Solution 1:[1]

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Solution 1:^[1]