[IDE] make replace.bodies.with.fatalError an internal refactoring.

This shouldn't be exposed to general users.

include/swift/IDE/RefactoringKinds.def

@@ -10,6 +10,10 @@
 #define RANGE_REFACTORING(KIND, NAME, ID) SEMANTIC_REFACTORING(KIND, NAME, ID)
 #endif
 
+#ifndef INTERNAL_RANGE_REFACTORING
+#define INTERNAL_RANGE_REFACTORING(KIND, NAME, ID) RANGE_REFACTORING(KIND, NAME, ID)
+#endif
+
 #ifndef CURSOR_REFACTORING
 #define CURSOR_REFACTORING(KIND, NAME, ID) SEMANTIC_REFACTORING(KIND, NAME, ID)
 #endif
@@ -60,9 +64,14 @@ RANGE_REFACTORING(ExpandTernaryExpr, "Expand Ternary Expression", expand.ternary
 
 RANGE_REFACTORING(ConvertToTernaryExpr, "Convert To Ternary Expression", convert.ternary.expr)
 
-RANGE_REFACTORING(ReplaceBodiesWithFatalError, "Replace Function Bodies With 'fatalError()'", replace.bodies.with.fatalError)
+// These internal refactorings are designed to be helpful for working on
+// the compiler/standard library, etc., but are likely to be just confusing and
+// noise for general development.
+
+INTERNAL_RANGE_REFACTORING(ReplaceBodiesWithFatalError, "Replace Function Bodies With 'fatalError()'", replace.bodies.with.fatalError)
 
 #undef CURSOR_REFACTORING
+#undef INTERNAL_RANGE_REFACTORING
 #undef RANGE_REFACTORING
 #undef SEMANTIC_REFACTORING
 #undef REFACTORING

lib/IDE/Refactoring.cpp

@@ -3099,9 +3099,14 @@ collectAvailableRefactorings(SourceFile *SF, RangeConfig Range,
                          Range.getEnd(SF->getASTContext().SourceMgr));
   ResolvedRangeInfo Result = Resolver.resolve();
 
+  bool enableInternalRefactoring = getenv("SWIFT_ENABLE_INTERNAL_REFACTORING_ACTIONS");
+
 #define RANGE_REFACTORING(KIND, NAME, ID)                                     \
   if (RefactoringAction##KIND::isApplicable(Result, DiagEngine))              \
     Scratch.push_back(RefactoringKind::KIND);
+#define INTERNAL_RANGE_REFACTORING(KIND, NAME, ID)                            \
+  if (enableInternalRefactoring)                                              \
+    RANGE_REFACTORING(KIND, NAME, ID)
 #include "swift/IDE/RefactoringKinds.def"
 
   RangeStartMayNeedRename = rangeStartMayNeedRename(Result);

test/refactoring/ReplaceBodiesWithFatalError/requires-env-var.swift

@@ -0,0 +1,16 @@
+var bar: Int {
+    return 0
+}
+// CHECK-NO-ENV-LABEL: Action begins
+// CHECK-NO-ENV-NEXT: Action ends
+
+// CHECK-ENV-LABEL: Action begins
+// CHECK-ENV-NEXT: Replace Function Bodies With 'fatalError()'
+// CHECK-ENV-NEXT: Action ends
+
+// replace.bodies.with.fatalError/-replace-bodies-with-fatalError should only be
+// found if the appropriate environment variable is set.
+
+// RUN: %refactor -actions -source-filename %s -pos=1:1 -end-pos=3:2 | %FileCheck %s -check-prefix CHECK-NO-ENV
+
+// RUN: env SWIFT_ENABLE_INTERNAL_REFACTORING_ACTIONS=1 %refactor -actions -source-filename %s -pos=1:1 -end-pos=3:2 | %FileCheck %s -check-prefix CHECK-ENV