forge coverage does not use same settings as forge build

[comunidadio]

Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

forge 0.2.0 (db96393 2023-05-11T00:10:51.773583000Z)

What command(s) is the bug in?

forge coverage

Operating System

macOS (Apple Silicon)

Describe the bug

➜ forge git:(master) ✗ forge build
[⠆] Compiling...
[⠒] Compiling 26 files with 0.8.19
[⠰] Solc 0.8.19 finished in 10.18s
Compiler run successful!
➜ forge git:(master) ✗ forge coverage
[⠢] Compiling...
[⠒] Compiling 26 files with 0.8.19
[⠑] Solc 0.8.19 finished in 1.37s
Error:
Compiler run failed:
Error: Unimplemented feature (/solidity/libsolidity/codegen/ArrayUtils.cpp:228):Copying of type struct MyStruct memory[] memory to storage not yet supported.

---

Expected behavior: same successful compilation as with "forge build" as "forge coverage" should use the same settings (like "forge test" who does run fine).
Actual behavior: getting an "unimplemented feature" error.

Note that I do the get the same compilation error with "forge build" if I remove "via_ir = true" from my foundry.toml file, so I guess some build settings are not passed consistently to coverage build.

[comunidadio]

I did try manually passing the option via "forge coverage --via-ir", same error.

Also just to confirm, "forge test" works fine with no issue as per "forge build".

[PaulRBerg]

Duplicate of #3527 (comment).

Also, see the discussion in #3978.

[PaulRBerg]

If you want forge coverage to work, you will need to make your code compile even without --via-ir. See my tweet.

[comunidadio]

Thanks for the tip @PaulRBerg. Refactored a bit and I managed to get coverage now.