unit type is not abi encodable at analyzer/src/namespace/types.rs:542:27

[agroce]

Compiling this file:

contract o
 event t
  _:()

thread 'main' panicked at 'unit type is not abi encodable', analyzer/src/namespace/types.rs:542:27
stack backtrace:
   0:     0x55bdbfeff890 - std::backtrace_rs::backtrace::libunwind::trace::h63b7a90188ab5fb3
                               at /rustc/9bc8c42bb2f19e745a63f3445f1ac248fb015e53/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
   1:     0x55bdbfeff890 - std::backtrace_rs::backtrace::trace_unsynchronized::h80aefbf9b851eca7
                               at /rustc/9bc8c42bb2f19e745a63f3445f1ac248fb015e53/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x55bdbfeff890 - std::sys_common::backtrace::_print_fmt::hbef05ae4237a4d72
                               at /rustc/9bc8c42bb2f19e745a63f3445f1ac248fb015e53/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x55bdbfeff890 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h28abce2fdb9884c2
                               at /rustc/9bc8c42bb2f19e745a63f3445f1ac248fb015e53/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x55bdbff18c0f - core::fmt::write::h3b84512577ca38a8
                               at /rustc/9bc8c42bb2f19e745a63f3445f1ac248fb015e53/library/core/src/fmt/mod.rs:1092:17
   5:     0x55bdbfefd2f2 - std::io::Write::write_fmt::h465f8feea02e2aa1
                               at /rustc/9bc8c42bb2f19e745a63f3445f1ac248fb015e53/library/std/src/io/mod.rs:1572:15
   6:     0x55bdbff01a05 - std::sys_common::backtrace::_print::h525280ee0d29bdde
                               at /rustc/9bc8c42bb2f19e745a63f3445f1ac248fb015e53/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x55bdbff01a05 - std::sys_common::backtrace::print::h1f0f5b9f3ef8fb78
                               at /rustc/9bc8c42bb2f19e745a63f3445f1ac248fb015e53/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x55bdbff01a05 - std::panicking::default_hook::{{closure}}::ha5838f6faa4a5a8f
                               at /rustc/9bc8c42bb2f19e745a63f3445f1ac248fb015e53/library/std/src/panicking.rs:208:50
   9:     0x55bdbff014b3 - std::panicking::default_hook::hfb9fe98acb0dcb3b
                               at /rustc/9bc8c42bb2f19e745a63f3445f1ac248fb015e53/library/std/src/panicking.rs:225:9
  10:     0x55bdbfcb0fef - fe_compiler::errors::DEFAULT_PANIC_HOOK::{{closure}}::{{closure}}::h8f119a8f95ba7581

You've hit an internal compiler error. This is a bug in the Fe compiler.
Fe is still under heavy development, and isn't yet ready for production use.

If you would, please report this bug at the following URL:
  https://github.com/ethereum/fe/issues/new
Aborted

Using

[profile.dev]
debug = true
panic = "abort"

for fuzzing. Using https://github.com/agroce/afl-compiler-fuzzer