Warning: failed to parse exception

[mauro3]

Making a .md file with this content:

```@example index
try
    error("a")
catch e
    print(e)
end
```

throws the warnings

┌ Warning: failed to parse exception in `src/index.md`
│   exception = Base.Meta.ParseError("unexpected \"catch\"")
└ @ Documenter.Utilities ~/.julia/dev/Documenter/src/Utilities/Utilities.jl:89
┌ Warning: failed to run code block in `src/index.md`:
│   value = a
└ @ Documenter.Expanders ~/.julia/dev/Documenter/src/Expanders.jl:487

and does not evaluate the block.