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Added error messages - Parsers.scala:712 #1842

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Merged
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Dec 21, 2016
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Added error messages - Parsers.scala:712 #1842

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44b8b5c
Added error messages - Parsers.scala:712
raindeerr Dec 21, 2016
e3da948
Tidied up imports and formatting
raindeerr Dec 21, 2016
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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/parsing/Parsers.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -730,7 +730,7 @@ object Parsers {

in.token match {
case ARROW => functionRest(t :: Nil)
case FORSOME => syntaxError("existential types no longer supported; use a wildcard type or dependent type instead"); t
case FORSOME => syntaxError(ExistentialTypesNoLongerSupported()); t
case _ => t
}
}
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26 changes: 24 additions & 2 deletions compiler/src/dotty/tools/dotc/reporting/diagnostic/messages.scala
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Expand Up @@ -5,8 +5,7 @@ package diagnostic

import dotc.core._
import Contexts.Context, Decorators._, Symbols._, Names._, NameOps._, Types._
import util.{SourceFile, NoSource}
import util.{SourcePosition, NoSourcePosition}
import util.SourcePosition
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This line shouldn't need to be added IIRC.

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These imports that were removed were unused, that's why I removed them. util.SourcePosition still needs to be included as it is in use in the MessageContainers.

I can put the imports back in if that's what you want

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Nah, it's fine boyscout principle right? 😃. The one below however didn't need to change right?

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@raindeerr raindeerr Dec 21, 2016 •
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That was my idea in cleaning up the used imports! 😄

No the one below shouldn't have changed, I've fixed that. That might have been the IDE trying to tidy up for me!

import config.Settings.Setting
import interfaces.Diagnostic.{ERROR, WARNING, INFO}
import printing.Highlighting._
Expand Down Expand Up @@ -901,4 +900,27 @@ object messages {
val msg = hl"trying to define package with same name as `$existing`"
val explanation = ""
}

case class ExistentialTypesNoLongerSupported()(implicit ctx: Context) extends Message(34) {
val kind = "Syntax"
val msg =
hl"""|Existential types are no longer supported -
|use a wildcard or dependent type instead"""
val explanation =
hl"""|The use of existential types is no longer supported.
|
|You should use a wildcard or dependent type instead.
|
|For example:
|
|Instead of using ${"forSome"} to specify a type variable
|
|${"List[T forSome { type T }]"}
|
|Try using a wildcard type variable
|
|${"List[_]"}
|"""
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Throughout this explanation, there's no need for there to be a padding of whitespace after the |-signs. None of the other messages should be doing this.

}

}