forge coverage failed with Error: could not find anchor: no matching instruction

[cwang25]

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 (49f35c7 2022-06-30T00:31:40.009286Z)

What command(s) is the bug in?

forge coverage

Operating System

macOS (Apple Silicon)

Describe the bug

When executing the forge coverage
The compile went through, but immediately after it failed with single line of error:

[⠊] Compiling...
[⠃] Compiling 26 files with 0.8.14
[⠊] Solc 0.8.14 finished in 1.77s
Compiler run successful (with warnings)
Analysing contracts...
Error: 
could not find anchor: no matching instruction in range <contract name>:226:2:22

[guacamoleoverflow]

Might be a similar issue to #2165?

Minimal repro I've found for forge coverage seems to be any contract that has an empty function (other than constructor with is fine), also on 49f35c7

pragma solidity ^0.8.13;
contract A {
  function b() public {}
}

results in could not find anchor: no matching instruction in range A:63:2:0

[onbjerg]

I'd wager it is because Solidity just optimizes the function away and doesn't bother with a source mapping. This will be fixed with #1965 which also covers other cases where bytecodes and source maps are missing 😄 Going to merge this issue into that one to keep the issue tracker clean. Thanks for the report 🙂