Handle Boolean literals as enum raw values.

Fixes rdar://problem/55384273.

Author: DougGregor

lib/Sema/DerivedConformanceRawRepresentable.cpp

@@ -43,6 +43,9 @@ static LiteralExpr *cloneRawLiteralExpr(ASTContext &C, LiteralExpr *expr) {
                                      /*implicit*/ true);
     if (floatLit->isNegative())
       cast<FloatLiteralExpr>(clone)->setNegative(expr->getLoc());
+  } else if (auto boolLit = dyn_cast<BooleanLiteralExpr>(expr)) {
+    clone = new (C) BooleanLiteralExpr(boolLit->getValue(), expr->getLoc(),
+                                       /*implicit*/true);
   } else {
     llvm_unreachable("invalid raw literal expr");
   }

lib/Sema/TypeCheckDecl.cpp

@@ -75,7 +75,7 @@ namespace {
 /// Float and integer literals are additionally keyed by numeric equivalence.
 struct RawValueKey {
   enum class Kind : uint8_t {
-    String, Float, Int, Tombstone, Empty
+    String, Float, Int, Bool, Tombstone, Empty
   } kind;
 
   struct IntValueTy {
@@ -101,6 +101,7 @@ struct RawValueKey {
     StringRef stringValue;
     IntValueTy intValue;
     FloatValueTy floatValue;
+    bool boolValue;
   };
 
   explicit RawValueKey(LiteralExpr *expr) {
@@ -136,6 +137,12 @@ struct RawValueKey {
       kind = Kind::String;
       stringValue = cast<StringLiteralExpr>(expr)->getValue();
       return;
+
+    case ExprKind::BooleanLiteral:
+      kind = Kind::Bool;
+      boolValue = cast<BooleanLiteralExpr>(expr)->getValue();
+      return;
+
     default:
       llvm_unreachable("not a valid literal expr for raw value");
     }
@@ -183,6 +190,8 @@ class DenseMapInfo<RawValueKey> {
              DenseMapInfo<uint64_t>::getHashValue(k.intValue.v1);
     case RawValueKey::Kind::String:
       return DenseMapInfo<StringRef>::getHashValue(k.stringValue);
+    case RawValueKey::Kind::Bool:
+      return DenseMapInfo<uint64_t>::getHashValue(k.boolValue);
     case RawValueKey::Kind::Empty:
     case RawValueKey::Kind::Tombstone:
       return 0;
@@ -204,6 +213,8 @@ class DenseMapInfo<RawValueKey> {
              a.intValue.v1 == b.intValue.v1;
     case RawValueKey::Kind::String:
       return a.stringValue.equals(b.stringValue);
+    case RawValueKey::Kind::Bool:
+      return a.boolValue == b.boolValue;
     case RawValueKey::Kind::Empty:
     case RawValueKey::Kind::Tombstone:
       return true;
@@ -1682,6 +1693,7 @@ EnumRawValuesRequest::evaluate(Evaluator &eval, EnumDecl *ED,
       continue;
     }
 
+
     // If the raw values of the enum case are fixed, then we trust our callers
     // to have set things up correctly.  This comes up with imported enums
     // and deserialized @objc enums which always have their raw values setup

test/decl/enum/bool_raw_value.swift

@@ -0,0 +1,16 @@
+// RUN: %target-typecheck-verify-swift
+extension Bool: ExpressibleByIntegerLiteral {
+	public init(integerLiteral value: Int) {
+		self = value != 0
+	}
+}
+
+enum IsDefinitelyRecursive : Bool, Equatable, Hashable {
+  case recursive=false
+}
+
+// expected-error@+1{{'IsRecursive' declares raw type 'Bool', but does not conform to RawRepresentable and conformance could not be synthesized}}
+enum IsRecursive : Bool, Equatable, Hashable {
+  case recursive=false
+  case nonrecursive // expected-error{{enum case must declare a raw value when the preceding raw value is not an integer}}
+}