Merge pull request #37440 from slavapestov/clean-up-generic-requirement-checking

Clean up duplicate logic for checking if generic requirements are satisfied

include/swift/AST/ActorIsolation.h

@@ -25,6 +25,7 @@ class raw_ostream;
 
 namespace swift {
 class DeclContext;
+class ModuleDecl;
 class NominalTypeDecl;
 class SubstitutionMap;
 
@@ -33,7 +34,7 @@ class SubstitutionMap;
 bool areTypesEqual(Type type1, Type type2);
 
 /// Determine whether the given type is suitable as a concurrent value type.
-bool isSendableType(const DeclContext *dc, Type type);
+bool isSendableType(ModuleDecl *module, Type type);
 
 /// Describes the actor isolation of a given declaration, which determines
 /// the actors with which it can interact.

include/swift/AST/Requirement.h

@@ -76,6 +76,21 @@ public:
 
   ProtocolDecl *getProtocolDecl() const;
 
+  /// Determines if this substituted requirement is satisfied.
+  ///
+  /// \param conditionalRequirements An out parameter initialized to an
+  /// array of requirements that the caller must check to ensure this
+  /// requirement is completely satisfied.
+  bool isSatisfied(ArrayRef<Requirement> &conditionalRequirements) const;
+
+  /// Determines if this substituted requirement can ever be satisfied,
+  /// possibly with additional substitutions.
+  ///
+  /// For example, if 'T' is unconstrained, then a superclass requirement
+  /// 'T : C' can be satisfied; however, if 'T' already has an unrelated
+  /// superclass requirement, 'T : C' cannot be satisfied.
+  bool canBeSatisfied() const;
+
   SWIFT_DEBUG_DUMP;
   void dump(raw_ostream &out) const;
   void print(raw_ostream &os, const PrintOptions &opts) const;