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lix/doc/manual/rl-next/print-value-in-installable-flake-error.md
Qyriad 20981461d4 print type and value in "flake attr is not a derivation" errors 
This turns errors like:

error: flake output attribute 'hydraJobs' is not a derivation or path

into errors like:

error: expected flake output attribute 'hydraJobs' to be a derivation or
path but found a set: { binaryTarball = «thunk»; build = «thunk»; etc> }

This change affects all InstallableFlake commands.

Change-Id: I899757af418b6f98201006ec6ee13a448c07077c
2024-05-21 05:55:13 -06:00

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synopsis credits category cls
New-cli flake commands that expect derivations now print the failing value and its type Qyriad Improvements 1177

In errors like flake output attribute 'legacyPackages.x86_64-linux.lib' is not a derivation or path, the message now includes the failing value and type.

Before:

    error: flake output attribute 'nixosConfigurations.yuki.config' is not a derivation or path

After:

    error: expected flake output attribute 'nixosConfigurations.yuki.config' to be a derivation or path but found a set: { appstream = «thunk»; assertions = «thunk»; boot = { bcache = «thunk»; binfmt = «thunk»; binfmtMiscRegistrations = «thunk»; blacklistedKernelModules = «thunk»; bootMount = «thunk»; bootspec = «thunk»; cleanTmpDir = «thunk»; consoleLogLevel = «thunk»; «43 attributes elided» }; «48 attributes elided» }