Get rid of the unused t and v type variables. Add the def type
variable, which models the fact that type annotations and definitions
start separate, but need to be combined before most stuff goes down.
Ports have the same structure as definitions in that annotations and
definitions are separate at the source level and need to be combined.
The same technique used in Expr is now used in Decl as well.
Provides an error message indicating incorrect compiler version or corrupt file.
Exit status will be 1 in either failure case and error message is printed to
stderr. Uses the same checks against interfaces.data as well as standard .elmi
files since both are susceptible to breaking in the same way.
The following will be displayed when an elmi file has a different compiler
version than the elm compiler that tries to load it:
justin ~/Code/elm-lang.org/public/examples/Intermediate $ ~/Code/elm/dist/build/elm/elm Pong.elm
Found build artifacts created by a different Elm compiler version. Please rebuilt cache/Pong.elmi and try again.
The following will be displayed when a file that cannot be deserialized is
encountered:
justin ~/Code/elm-lang.org/public/examples/Intermediate $ ~/Code/elm/dist/build/elm/elm Pong.elm
Got an error, 'demandInput: not enough bytes' at offset 10303 of cache/Pong.elmi.
This error may be due to an outdated or corrupt artifact from a previous build. Please rebuild cache/Pong.elmi and try again.
