[gardening] Shell fixes. Consistent headers. a-vs-an typos. Python fixes. Unused variables and methods.

.pep8

@@ -1,2 +1,2 @@
 [flake8]
-filename = *.py,80+-check,backtrace-check,Benchmark_Driver,Benchmark_DTrace.in,Benchmark_GuardMalloc.in,Benchmark_RuntimeLeaksRunner.in,build-script,check-incremental,clang++,coverage-build-db,coverage-generate-data,coverage-query-db,coverage-touch-tests,gyb,ld,line-directive,mock-distcc,ns-html2rst,PathSanitizingFileCheck,recursive-lipo,rth,run-test,scale-test,submit-benchmark-results,update-checkout,viewcfg,symbolicate-linux-fatal
+filename = *.py,80+-check,backtrace-check,Benchmark_Driver,Benchmark_DTrace.in,Benchmark_GuardMalloc.in,Benchmark_RuntimeLeaksRunner.in,build-script,check-incremental,clang++,coverage-build-db,coverage-generate-data,coverage-query-db,coverage-touch-tests,gyb,ld,line-directive,mock-distcc,ns-html2rst,PathSanitizingFileCheck,python-lint,recursive-lipo,round-trip-syntax-test,rth,run-test,scale-test,submit-benchmark-results,update-checkout,viewcfg,symbolicate-linux-fatal

include/swift/AST/GenericSignatureBuilder.h

@@ -264,7 +264,7 @@ class RequirementSource : public llvm::FoldingSetNode {
                                               GenericSignatureBuilder &builder,
                                               ProtocolDecl *protocol);
 
-  /// Retrieve an requirement source for nested type name matches.
+  /// Retrieve a requirement source for nested type name matches.
   static const RequirementSource *forNestedTypeNameMatch(
                                               GenericSignatureBuilder &builder);
 

include/swift/Basic/OwnedString.h

@@ -2,7 +2,7 @@
 //
 // This source file is part of the Swift.org open source project
 //
-// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
+// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
 // Licensed under Apache License v2.0 with Runtime Library Exception
 //
 // See https://swift.org/LICENSE.txt for license information

include/swift/IDE/Utils.h

@@ -307,7 +307,7 @@ class DeclNameViewer {
   unsigned commonPartsCount(DeclNameViewer &Other) const;
 };
 
-/// This provide a utility for writing to a underlying string buffer multiple
+/// This provide a utility for writing to an underlying string buffer mulitiple
 /// string pieces and retrieve them later when the underlying buffer is stable.
 class DelayedStringRetriever : public raw_ostream {
     SmallVectorImpl<char> &OS;

include/swift/Sema/Semantics.h

@@ -1,4 +1,4 @@
-//===--- Semantics.h - Swift Container for Semantic Info ----*- C++ -*-===//
+//===--- Semantics.h - Swift Container for Semantic Info --------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Syntax/DeclSyntax.h

@@ -1,4 +1,4 @@
-//===--- DeclSyntax.cpp - Declaration Syntax Interface ----------*- C++ -*-===//
+//===--- DeclSyntax.h - Declaration Syntax Interface ------------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Syntax/ExprSyntax.h

@@ -1,4 +1,4 @@
-//===--- ExprSyntax.h - Swift Expression Syntax Interface --------*- C++ -*-===//
+//===--- ExprSyntax.h - Swift Expression Syntax Interface -------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Syntax/Format.h

@@ -1,4 +1,4 @@
-//===--- Format.cpp - Declaration Syntax Formatting Interface ---*- C++ -*-===//
+//===--- Format.h - Declaration Syntax Formatting Interface -----*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Syntax/GenericSyntax.h

@@ -1,4 +1,4 @@
-//===--- GenericSyntax.cpp - Swift Generic Syntax Interface -----*- C++ -*-===//
+//===--- GenericSyntax.h - Swift Generic Syntax Interface -------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //

include/swift/Syntax/SyntaxFactory.h

@@ -353,7 +353,7 @@ struct SyntaxFactory {
   /// Make a metatype type with all elements marked as missing.
   static MetatypeTypeSyntax makeBlankMetatypeType();
 
-  /// Make an sugared Array type, as in `[MyType]`.
+  /// Make a sugared Array type, as in `[MyType]`.
   static ArrayTypeSyntax makeArrayType(RC<TokenSyntax> LeftSquareBracket,
                                        TypeSyntax ElementType,
                                        RC<TokenSyntax> RightSquareBracket);

include/swift/Syntax/SyntaxKinds.def

@@ -1,4 +1,4 @@
-//===--- SyntaxKinds.def - Swift Syntax Node Metaprogramming -------------===//
+//===--- SyntaxKinds.def - Swift Syntax Node Metaprogramming --------------===//
 //
 // This source file is part of the Swift.org open source project
 //

lib/AST/GenericSignatureBuilder.cpp

@@ -2283,15 +2283,6 @@ class GenericSignatureBuilder::InferRequirementsWalker : public TypeWalker {
   unsigned MinDepth;
   unsigned MaxDepth;
 
-  /// We cannot add requirements to archetypes from outer generic parameter
-  /// lists.
-  bool isOuterArchetype(PotentialArchetype *PA) {
-    unsigned ParamDepth = PA->getRootGenericParamKey().Depth;
-    assert(ParamDepth <= MaxDepth);
-    (void) MaxDepth;
-    return ParamDepth < MinDepth;
-  }
-
 public:
   InferRequirementsWalker(GenericSignatureBuilder &builder,
                           TypeRepr *typeRepr,

lib/Index/Index.cpp

@@ -605,7 +605,7 @@ bool IndexSwiftASTWalker::startEntityDecl(ValueDecl *D) {
         return false;
 
     } else if (auto ParentED = dyn_cast<ExtensionDecl>(Parent)) {
-      if (NominalTypeDecl *NTD = ParentED->getExtendedType()->getAnyNominal()) {
+      if (ParentED->getExtendedType()->getAnyNominal()) {
         if (addRelation(Info, (SymbolRoleSet) SymbolRole::RelationChildOf, ParentED))
           return false;
       }

lib/SILGen/SILGenPoly.cpp

@@ -1097,7 +1097,7 @@ namespace {
         SGF.B.createInitExistentialAddr(Loc, existentialBuf,
                                         inputTupleType,
                                         concreteTL.getLoweredType(),
-                                        /*Conformances=*/{});
+                                        /*conformances=*/{});
 
       auto tupleTemp = SGF.useBufferAsTemporary(tupleBuf, concreteTL);
       translateAndImplodeInto(inputOrigType, inputTupleType,
@@ -1911,7 +1911,7 @@ ResultPlanner::planTupleIntoIndirectResult(AbstractionPattern innerOrigType,
     SILValue outerConcreteResultAddr
       = Gen.B.createInitExistentialAddr(Loc, outerResultAddr, innerSubstType,
                                         Gen.getLoweredType(opaque, innerSubstType),
-                                        /*Conformances=*/{});
+                                        /*conformances=*/{});
 
     // Emit into that address.
     planTupleIntoIndirectResult(innerOrigType, innerSubstType,

lib/Syntax/DeclSyntax.cpp

@@ -1,4 +1,4 @@
-//===--- DeclSyntax.cpp - Declaration Syntax Implementation -----*- C++ -*-===//
+//===--- DeclSyntax.cpp - Declaration Syntax Implementation ---------------===//
 //
 // This source file is part of the Swift.org open source project
 //

lib/Syntax/Format.cpp

@@ -1,4 +1,4 @@
-//===--- Format.cpp - Declaration Syntax Formatting Impl. -------*- C++ -*-===//
+//===--- Format.cpp - Declaration Syntax Formatting Impl. -----------------===//
 //
 // This source file is part of the Swift.org open source project
 //

lib/Syntax/GenericSyntax.cpp

@@ -1,4 +1,4 @@
-//===--- GenericSyntax.cpp - Swift Generic Syntax Implementation *- C++ -*-===//
+//===--- GenericSyntax.cpp - Swift Generic Syntax Implementation ----------===//
 //
 // This source file is part of the Swift.org open source project
 //

lib/Syntax/LegacyASTTransformer.cpp

@@ -1,4 +1,4 @@
-//===--- LegacyASTTransformer.cpp - Swift lib/AST -> lib/Syntax -*- C++ -*-===//
+//===--- LegacyASTTransformer.cpp - Swift lib/AST -> lib/Syntax -----------===//
 //
 // This source file is part of the Swift.org open source project
 //

lib/Syntax/RawSyntax.cpp

@@ -1,4 +1,4 @@
-//===--- RawSyntax.cpp - Swift Raw Syntax Implementation --------*- C++ -*-===//
+//===--- RawSyntax.cpp - Swift Raw Syntax Implementation ------------------===//
 //
 // This source file is part of the Swift.org open source project
 //

lib/Syntax/StmtSyntax.cpp

@@ -1,4 +1,4 @@
-//===--- StmtSyntax.cpp - Swift Statement Syntax Implementation -*- C++ -*-===//
+//===--- StmtSyntax.cpp - Swift Statement Syntax Implementation -----------===//
 //
 // This source file is part of the Swift.org open source project
 //

lib/Syntax/Syntax.cpp

@@ -1,4 +1,4 @@
-//===--- Syntax.cpp - Swift Syntax Implementation ---------------*- C++ -*-===//
+//===--- Syntax.cpp - Swift Syntax Implementation -------------------------===//
 //
 // This source file is part of the Swift.org open source project
 //

lib/Syntax/SyntaxData.cpp

@@ -1,4 +1,4 @@
-//===--- SyntaxData.cpp - Swift Syntax Data Implementation ------*- C++ -*-===//
+//===--- SyntaxData.cpp - Swift Syntax Data Implementation ----------------===//
 //
 // This source file is part of the Swift.org open source project
 //

lib/Syntax/SyntaxFactory.cpp

@@ -1,4 +1,4 @@
-//===--- SyntaxFactory.cpp - Swift Syntax Builder Implementation *- C++ -*-===//
+//===--- SyntaxFactory.cpp - Swift Syntax Builder Implementation ----------===//
 //
 // This source file is part of the Swift.org open source project
 //

lib/Syntax/TokenSyntax.cpp

@@ -1,4 +1,4 @@
-//===--- TokenSyntax.cpp - Swift Token Syntax Implementation ----*- C++ -*-===//
+//===--- TokenSyntax.cpp - Swift Token Syntax Implementation --------------===//
 //
 // This source file is part of the Swift.org open source project
 //

lib/Syntax/Trivia.cpp

@@ -1,4 +1,4 @@
-//===--- Syntax.cpp - Swift Syntax Trivia Implementation --------*- C++ -*-===//
+//===--- Trivia.cpp - Swift Syntax Trivia Implementation ------------------===//
 //
 // This source file is part of the Swift.org open source project
 //

lib/Syntax/TypeSyntax.cpp

@@ -1,4 +1,4 @@
-//===--- TypeSyntax.cpp - Swift Type Syntax Implementation ------*- C++ -*-===//
+//===--- TypeSyntax.cpp - Swift Type Syntax Implementation ----------------===//
 //
 // This source file is part of the Swift.org open source project
 //

stdlib/public/runtime/Metadata.cpp

@@ -2821,7 +2821,7 @@ namespace {
     /// The number of bytes remaining.
     size_t Remaining;
   };
-}
+} // end anonymous namespace
 
 // A statically-allocated pool.  It's zero-initialized, so this
 // doesn't cost us anything in binary size.

tools/SourceKit/lib/SwiftLang/SwiftSourceDocInfo.cpp

@@ -724,8 +724,6 @@ static bool passCursorInfoForDecl(const ValueDecl *VD,
 
   DelayedStringRetriever OverUSRsStream(SS);
 
-  SmallVector<std::pair<unsigned, unsigned>, 4> OverUSROffs;
-
   ide::walkOverriddenDecls(VD,
     [&](llvm::PointerUnion<const ValueDecl*, const clang::NamedDecl*> D) {
       OverUSRsStream.startPiece();

tools/swift-syntax-format/swift-syntax-format.cpp

@@ -1,4 +1,4 @@
-//===--- swift-syntax-test.cpp - Reflection Syntax testing application ----===//
+//===--- swift-syntax-format.cpp - Reflection Syntax testing application --===//
 //
 // This source file is part of the Swift.org open source project
 //

utils/rusage.py

@@ -91,7 +91,7 @@ def __call__(self, parser, namespace, v, option_string=None):
 args = parser.parse_args()
 if len(args.remainder) == 0:
     parser.print_help()
-    exit(1)
+    sys.exit(1)
 
 if args.enforce:
     if args.time is not None:

validation-test/BuildSystem/LTO/object-files-do-have-bitcode.test-sh

@@ -13,14 +13,14 @@ set -u
 # REQUIRES: OS=macosx
 # RUN: %s %swift_obj_root
 
-if [[ -n "$(find $1/lib -iname '*.cpp.o' -type f -exec file {} \; | grep -v -e bitcode -e bit-code)" ]]; then
+if find $1/lib -iname '*.cpp.o' -type f -exec file {} \; | grep -q -v -e bitcode -e bit-code; then
     echo "Found a ./lib non-bitcode object file!"
     exit 1
 else
     echo "All ./lib object files are bit-code files!"
 fi
 
-if [[ -n "$(find $1/unittests -iname '*.cpp.o' -type f -exec file {} \; | grep -v -e bitcode -e bit-code)" ]]; then
+if find $1/unittests -iname '*.cpp.o' -type f -exec file {} \; | grep -q -v -e bitcode -e bit-code; then
     echo "Found a ./unittests non-bitcode object file!"
     exit 1
 else

validation-test/BuildSystem/LTO/target-libraries-do-not-have-bitcode.test-sh

@@ -34,7 +34,7 @@ function check_thin_archive_for_bitcode() {
     mkdir -p "${LIB_TEMP_DIR}"
     cd "${LIB_TEMP_DIR}"
     ar -x ${ARCHIVE}
-    if [[ -n "$(find ./ -iname '*.o' -exec file {} \; | grep -e bitcode -e bit-code)" ]]; then
+    if find ./ -iname '*.o' -exec file {} \; | grep -q -v -e bitcode -e bit-code; then
         echo "Found bitcode file in thin archive: ${ARCHIVE}"
         exit 1
     else
@@ -78,7 +78,7 @@ function check_thick_archive_for_bitcode() {
         cd ${arch}
         ar -x "${LIB_ARCHIVE_DIR}/${THIN_ARCHIVE}"
 
-        if [[ -n "$(find ./ -iname '*.o' -exec file {} \; | grep -e bitcode -e bit-code)" ]]; then
+        if find ./ -iname '*.o' -exec file {} \; | grep -q -e bitcode -e bit-code; then
             echo "Found bitcode file in thin archive: ${THIN_ARCHIVE}. Taken from thick archive: ${ARCHIVE}"
             exit 1
         else