docs for 'cabal configure' falsely claims "check the resulting configuration works"

[Mikolaj]

Commandline docs for cabal configure say

Examples:
  cabal configure --with-compiler ghc-7.10.3
    Adjust the project configuration to use the given compiler
    program and check the resulting configuration works.
  cabal configure
    Reset the local configuration to empty and check the overall
    project configuration works.

but the "check the resulting configuration works" is not true any more, because that functionality has been removed. Now 'cabal build' does that as part of the build process.

[ulysses4ever]

#8106 fixed it.