Staticlib engine causes rust panic when creating a wasm instance

[HeliosPanoptes]

Describe the bug

wasmer 2.0.0 | rustc 1.54.0-nightly (3e99439f4 2021-05-17) | x86_64

When making a wasm module instance with the staticlib engine, wasmer panics:

thread 'main' panicked at 'index out of bounds: the len is 0 but the index is 0', /Users/GW/.cargo/registry/src/github.com-1ecc6299db9ec823/wasmer-vm-2.0.0/src/instance/mod.rs:1079:29

Here is a test project.
wasmer-bug.zip

When digging in to the stack trace, at lookup_by_declaration wasmer-vm-2.0.0/src/instance/mod.rs:1079,
instance-ref.functions.elems.length is 0. When instantiating a module with universal or dylib, the length instead shows up as 2.

Steps to reproduce

For example,

1. Open the test project: wasmer-bug.zip
2. Run with cargo run -- --engine universal test.wasm
3. See an output value
4. Run with cargo run -- --engine staticlib test.wasm
5. See the panic dump

Expected behavior

That wasmer does not panic when using staticlib

Actual behavior

That wasmer panics when using staticlib

Additional context

None that I can think of.

[orangeC23]

I found this problem occurred again, in macOS with wasmer2.3.0.

[epilys]

@Zhangyx24 your screenshot says the verson is 2.0.0. Can you retry with 2.3.0?