Index: clang/include/clang/AST/DeclCXX.h
===================================================================
--- clang/include/clang/AST/DeclCXX.h
+++ clang/include/clang/AST/DeclCXX.h
@@ -2425,12 +2425,12 @@
                      : ExplicitSpecKind::ResolvedFalse);
   }
 
-  enum TraillingAllocKind {
+  enum TrailingAllocKind {
     TAKInheritsConstructor = 1,
     TAKHasTailExplicit = 1 << 1,
   };
 
-  uint64_t getTraillingAllocKind() const {
+  uint64_t getTrailingAllocKind() const {
     return numTrailingObjects(OverloadToken<InheritedConstructor>()) |
            (numTrailingObjects(OverloadToken<ExplicitSpecifier>()) << 1);
   }
Index: clang/lib/AST/DeclCXX.cpp
===================================================================
--- clang/lib/AST/DeclCXX.cpp
+++ clang/lib/AST/DeclCXX.cpp
@@ -2600,19 +2600,19 @@
 CXXConstructorDecl *CXXConstructorDecl::CreateDeserialized(ASTContext &C,
                                                            unsigned ID,
                                                            uint64_t AllocKind) {
-  bool hasTraillingExplicit = static_cast<bool>(AllocKind & TAKHasTailExplicit);
+  bool hasTrailingExplicit = static_cast<bool>(AllocKind & TAKHasTailExplicit);
   bool isInheritingConstructor =
       static_cast<bool>(AllocKind & TAKInheritsConstructor);
   unsigned Extra =
       additionalSizeToAlloc<InheritedConstructor, ExplicitSpecifier>(
-          isInheritingConstructor, hasTraillingExplicit);
+          isInheritingConstructor, hasTrailingExplicit);
   auto *Result = new (C, ID, Extra) CXXConstructorDecl(
       C, nullptr, SourceLocation(), DeclarationNameInfo(), QualType(), nullptr,
       ExplicitSpecifier(), false, false, ConstexprSpecKind::Unspecified,
       InheritedConstructor(), nullptr);
   Result->setInheritingConstructor(isInheritingConstructor);
   Result->CXXConstructorDeclBits.HasTrailingExplicitSpecifier =
-      hasTraillingExplicit;
+      hasTrailingExplicit;
   Result->setExplicitSpecifier(ExplicitSpecifier());
   return Result;
 }
Index: clang/lib/Serialization/ASTWriterDecl.cpp
===================================================================
--- clang/lib/Serialization/ASTWriterDecl.cpp
+++ clang/lib/Serialization/ASTWriterDecl.cpp
@@ -1389,7 +1389,7 @@
 }
 
 void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
-  Record.push_back(D->getTraillingAllocKind());
+  Record.push_back(D->getTrailingAllocKind());
   addExplicitSpecifier(D->getExplicitSpecifier(), Record);
   if (auto Inherited = D->getInheritedConstructor()) {
     Record.AddDeclRef(Inherited.getShadowDecl());
Index: clang/test/SemaCXX/cxx2a-explicit-bool.cpp
===================================================================
--- clang/test/SemaCXX/cxx2a-explicit-bool.cpp
+++ clang/test/SemaCXX/cxx2a-explicit-bool.cpp
@@ -84,7 +84,7 @@
 
 }
 
-namespace trailling_object {
+namespace trailing_object {
 
 template<bool b>
 struct B {