Merge pull request #5825 from dotty-staging/change-implied

Syntax changes for new implicits

Author: odersky

compiler/src/dotty/tools/dotc/ast/Desugar.scala

@@ -1089,8 +1089,8 @@ object desugar {
   }
 
   def makeContextualFunction(formals: List[Type], body: Tree)(implicit ctx: Context): Tree = {
-    val params = makeImplicitParameters(formals.map(TypeTree), Contextual)
-    new FunctionWithMods(params, body, Modifiers(Implicit | Contextual))
+    val params = makeImplicitParameters(formals.map(TypeTree), Given)
+    new FunctionWithMods(params, body, Modifiers(Implicit | Given))
   }
 
   /** Add annotation to tree:

compiler/src/dotty/tools/dotc/ast/TreeInfo.scala

@@ -331,13 +331,13 @@ trait UntypedTreeInfo extends TreeInfo[Untyped] { self: Trees.Instance[Untyped]
 
   /** Is `tree` an implicit function or closure, possibly nested in a block? */
   def isContextualClosure(tree: Tree)(implicit ctx: Context): Boolean = unsplice(tree) match {
-    case tree: FunctionWithMods => tree.mods.is(Contextual)
-    case Function((param: untpd.ValDef) :: _, _) => param.mods.is(Contextual)
+    case tree: FunctionWithMods => tree.mods.is(Given)
+    case Function((param: untpd.ValDef) :: _, _) => param.mods.is(Given)
     case Closure(_, meth, _) => true
     case Block(Nil, expr) => isContextualClosure(expr)
     case Block(DefDef(nme.ANON_FUN, _, params :: _, _, _) :: Nil, cl: Closure) =>
       params match {
-        case param :: _ => param.mods.is(Contextual)
+        case param :: _ => param.mods.is(Given)
         case Nil => cl.tpt.eq(untpd.ContextualEmptyTree) || defn.isImplicitFunctionType(cl.tpt.typeOpt)
       }
     case _ => false

compiler/src/dotty/tools/dotc/ast/tpd.scala

@@ -234,7 +234,7 @@ object tpd extends Trees.Instance[Type] with TypedTreeInfo {
 
         def valueParam(name: TermName, origInfo: Type): TermSymbol = {
           val maybeImplicit =
-            if (tp.isContextual) Implicit | Contextual
+            if (tp.isContextual) Implicit | Given
             else if (tp.isImplicitMethod) Implicit
             else EmptyFlags
           val maybeErased = if (tp.isErasedMethod) Erased else EmptyFlags

compiler/src/dotty/tools/dotc/ast/untpd.scala

@@ -132,6 +132,8 @@ object untpd extends Trees.Instance[Untyped] with UntypedTreeInfo {
 
     case class Implicit()(implicit @constructorOnly src: SourceFile) extends Mod(Flags.ImplicitCommon)
 
+    case class Given()(implicit @constructorOnly src: SourceFile) extends Mod(Flags.ImplicitCommon | Flags.Given)
+
     case class Erased()(implicit @constructorOnly src: SourceFile) extends Mod(Flags.Erased)
 
     case class Final()(implicit @constructorOnly src: SourceFile) extends Mod(Flags.Final)

compiler/src/dotty/tools/dotc/core/Definitions.scala

@@ -100,7 +100,7 @@ class Definitions {
    *  ImplicitFunctionN traits follow this template:
    *
    *      trait ImplicitFunctionN[T0,...,T{N-1}, R] extends Object {
-   *        def apply with ($x0: T0, ..., $x{N_1}: T{N-1}): R
+   *        def apply given ($x0: T0, ..., $x{N_1}: T{N-1}): R
    *      }
    *
    *  ErasedFunctionN traits follow this template:
@@ -112,7 +112,7 @@ class Definitions {
    *  ErasedImplicitFunctionN traits follow this template:
    *
    *      trait ErasedImplicitFunctionN[T0,...,T{N-1}, R] extends Object {
-   *        def apply with (erased $x0: T0, ..., $x{N_1}: T{N-1}): R
+   *        def apply given (erased $x0: T0, ..., $x{N_1}: T{N-1}): R
    *      }
    *
    *  ErasedFunctionN and ErasedImplicitFunctionN erase to Function0.

compiler/src/dotty/tools/dotc/core/Flags.scala

@@ -347,8 +347,8 @@ object Flags {
   /** An extension method */
   final val Extension = termFlag(28, "<extension>")
 
-  /** A contextual (with) parameter */
-  final val Contextual = commonFlag(29, "<contextual>")
+  /** An inferable (`given`) parameter */
+  final val Given = commonFlag(29, "given")
 
   /** Symbol is defined by a Java class */
   final val JavaDefined: FlagSet = commonFlag(30, "<java>")

compiler/src/dotty/tools/dotc/core/StdNames.scala

@@ -483,7 +483,6 @@ object StdNames {
     val notifyAll_ : N          = "notifyAll"
     val notify_ : N             = "notify"
     val null_ : N               = "null"
-    val of: N                   = "of"
     val ofDim: N                = "ofDim"
     val opaque: N               = "opaque"
     val ordinal: N              = "ordinal"

compiler/src/dotty/tools/dotc/core/Types.scala

@@ -3879,11 +3879,11 @@ object Types {
     def selfType(implicit ctx: Context): Type = {
       if (selfTypeCache == null)
         selfTypeCache = {
-          val given = cls.givenSelfType
-          if (!given.isValueType) appliedRef
-          else if (cls is Module) given
+          val givenSelf = cls.givenSelfType
+          if (!givenSelf.isValueType) appliedRef
+          else if (cls is Module) givenSelf
           else if (ctx.erasedTypes) appliedRef
-          else AndType(given, appliedRef)
+          else AndType(givenSelf, appliedRef)
         }
       selfTypeCache
     }

compiler/src/dotty/tools/dotc/core/tasty/TastyFormat.scala

@@ -203,7 +203,7 @@ Standard-Section: "ASTs" TopLevelStat*
                   DEFAULTparameterized                // Method with default parameters
                   STABLE                              // Method that is assumed to be stable
                   EXTENSION                           // An extension method
-                  CONTEXTUAL                          // new style implicit parameters, introduced with `with`
+                  GIVEN                               // new style implicit parameters, introduced with `given`
                   PARAMsetter                         // A setter without a body named `x_=` where `x` is pickled as a PARAM
                   Annotation
 
@@ -323,7 +323,7 @@ object TastyFormat {
   final val ERASED = 34
   final val OPAQUE = 35
   final val EXTENSION = 36
-  final val CONTEXTUAL = 37
+  final val GIVEN = 37
   final val PARAMsetter = 38
 
   // Cat. 2:    tag Nat
@@ -497,7 +497,7 @@ object TastyFormat {
        | DEFAULTparameterized
        | STABLE
        | EXTENSION
-       | CONTEXTUAL
+       | GIVEN
        | PARAMsetter
        | ANNOTATION
        | PRIVATEqualified
@@ -558,7 +558,7 @@ object TastyFormat {
     case DEFAULTparameterized => "DEFAULTparameterized"
     case STABLE => "STABLE"
     case EXTENSION => "EXTENSION"
-    case CONTEXTUAL => "CONTEXTUAL"
+    case GIVEN => "GIVEN"
     case PARAMsetter => "PARAMsetter"
 
     case SHAREDterm => "SHAREDterm"

compiler/src/dotty/tools/dotc/core/tasty/TreePickler.scala

@@ -655,7 +655,7 @@ class TreePickler(pickler: TastyPickler) {
       if (flags is DefaultParameterized) writeByte(DEFAULTparameterized)
       if (flags is StableRealizable) writeByte(STABLE)
       if (flags is Extension) writeByte(EXTENSION)
-      if (flags is Contextual) writeByte(CONTEXTUAL)
+      if (flags is Given) writeByte(GIVEN)
       if (flags is ParamAccessor) writeByte(PARAMsetter)
       assert(!(flags is Label))
     } else {