WAB plug and compose fails?

Hi,
I've tested the 'hello' example with my installation and it works... Thanks for building WAC! However, I'm not able to run the following example:
```
package bab:compound; // Compound.wit
world compound-world {
export compound-interface: interface { // Inline def. of interface...
compound-function: func();
}
}
```
/**/
```
package bab:composite; // 'Composite.wit'
world composite-world { // a.k.a. "socket" component
import compound-interface: interface { // Inline def. of interface...
compound-function: func();
}
}
```
**/* Transform wit into wasm: */**
```
wasm-tools component wit --wasm -o ./composition/Compound.wasm ./composition/Compound.wit
wasm-tools component wit --wasm -o ./composition/Composite.wasm ./composition/Composite.wit
```
**/* Compose with 'plug': */**
`wac plug --plug ./composition/Compound.wasm ./composition/Composite.wasm -o ./composition/Composition.wasm`
/* Error message is: */
error: the socket component had no matching imports for the plugs that were provided

I've feeling that the error message is "wrong" because the "compound-interface" matches? Thanks for any help... Regards.
PS: `wac compose` does *NOT* work as well (open an other issue on that...)