b45938a972
1. `[[...]]` is more robust wrt empty expansions than `[..]`
2. `${foo-}` is simpler and won't accidentally be a url compared to
`${foo:-}`
3. `+=` works even when the variable is undefined.
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| .. | ||
| applications | ||
| build-support | ||
| common-updater | ||
| data | ||
| desktops | ||
| development | ||
| games | ||
| misc | ||
| os-specific | ||
| servers | ||
| shells | ||
| stdenv | ||
| test | ||
| tools | ||
| top-level | ||