In GHCi, when the user attempts to add a module that can not be found, the error message for that module will be repeated for any subsequent :add calls.

ghci> :add Slightly/Misspelled/File.hs
<no location info>: error:
can't find file: Slightly/Misspelled/File.hs

...
ghci> :add Correctly/Spelled/File.hs
<no location info>: error:
can't find file: Slightly/Misspelled/File.hs