Sema: Reject version specs in @available attributes for custom domains.

include/swift/AST/Attr.h

@@ -3319,7 +3319,7 @@ public:
     return attr->getRawIntroduced();
   }
 
-  /// The source range of the `introduced:` component.
+  /// The source range of the `introduced:` version component.
   SourceRange getIntroducedSourceRange() const { return attr->IntroducedRange; }
 
   /// Returns the effective range in which the declaration with this attribute
@@ -3331,11 +3331,17 @@ public:
     return attr->getRawDeprecated();
   }
 
+  /// The source range of the `deprecated:` version component.
+  SourceRange getDeprecatedSourceRange() const { return attr->DeprecatedRange; }
+
   /// The version tuple written in source for the `obsoleted:` component.
   std::optional<llvm::VersionTuple> getObsoleted() const {
     return attr->getRawObsoleted();
   }
 
+  /// The source range of the `obsoleted:` version component.
+  SourceRange getObsoletedSourceRange() const { return attr->ObsoletedRange; }
+
   /// Returns the `message:` field of the attribute, or an empty string.
   StringRef getMessage() const { return attr->Message; }
 

include/swift/AST/AvailabilityDomain.h

@@ -190,6 +190,10 @@ public:
     return PlatformKind::none;
   }
 
+  /// Returns true if availability for this domain can be specified in terms of
+  /// version ranges.
+  bool isVersioned() const;
+
   /// Returns true if this domain is considered active in the current
   /// compilation context.
   bool isActive(const ASTContext &ctx) const;

include/swift/AST/DiagnosticsParse.def

@@ -1579,10 +1579,6 @@ ERROR(attr_availability_expected_equal,none,
 ERROR(attr_availability_expected_version,none,
       "expected version number in '%0' attribute", (StringRef))
 
-WARNING(attr_availability_nonspecific_platform_unexpected_version,none,
-      "unexpected version number in '%0' attribute for non-specific platform "
-      "'*'", (StringRef))
-
 WARNING(attr_availability_wildcard_ignored,none,
         "* as platform name has no effect in '%0' attribute", (StringRef))
 

include/swift/AST/DiagnosticsSema.def

@@ -6735,6 +6735,9 @@ ERROR(attr_availability_requires_custom_availability, none,
       "specifying '%0' in '%1' attribute requires "
       "-enable-experimental-feature CustomAvailability",
       (StringRef, const DeclAttribute))
+WARNING(attr_availability_unexpected_version,none,
+       "unexpected version number in '%0' attribute for '%1'",
+       (const DeclAttribute, StringRef))
 
 ERROR(availability_decl_unavailable, none,
       "%0 is unavailable%select{ in %2|}1%select{|: %3}3",