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; contributing: mention the need for a regular build before ghci

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Simon Michael 2019-05-21 13:45:08 -07:00
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CONTRIBUTING.md
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@ -1442,7 +1442,14 @@ Locally runs tests similar to what we run on Travis CI.
### Use GHCI
GHCI is GHC's REPL, useful for exploring and calling code interactively.
GHCI is GHC's [REPL](https://en.wikipedia.org/wiki/Read%E2%80%93eval%E2%80%93print_loop),
useful for exploring and calling code interactively.
If you try to run GHCI (or things based on it, like ghcid)
right after cloning the hledger repo, you might see an error about CPP macros, eg like
[on #961](https://github.com/simonmichael/hledger/issues/961#issuecomment-459283412).
To fix this, build the hledger packages once, eg `stack build`.
(Or `stack build hledger` might be enough, depending what you are doing.)
#### Get a GHCI prompt for hledger-lib: