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diff --git a/js/src/frontend/ParseContext-inl.h b/js/src/frontend/ParseContext-inl.h
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+++ b/js/src/frontend/ParseContext-inl.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef frontend_ParseContext_inl_h
+#define frontend_ParseContext_inl_h
+
+#include "frontend/ParseContext.h"
+
+#include "mozilla/ResultVariant.h"
+
+#include "frontend/Parser.h"
+#include "vm/JSContext.h"
+
+namespace js {
+namespace frontend {
+
+template <>
+inline bool ParseContext::Statement::is<ParseContext::LabelStatement>() const {
+  return kind_ == StatementKind::Label;
+}
+
+template <>
+inline bool ParseContext::Statement::is<ParseContext::ClassStatement>() const {
+  return kind_ == StatementKind::Class;
+}
+
+template <typename T>
+inline T& ParseContext::Statement::as() {
+  MOZ_ASSERT(is<T>());
+  return static_cast<T&>(*this);
+}
+
+inline ParseContext::Scope::BindingIter ParseContext::Scope::bindings(
+    ParseContext* pc) {
+  // In function scopes with parameter expressions, function special names
+  // (like '.this') are declared as vars in the function scope, despite its
+  // not being the var scope.
+  return BindingIter(*this, pc->varScope_ == this ||
+                                pc->functionScope_.ptrOr(nullptr) == this);
+}
+
+inline ParseContext::Scope::Scope(ParserBase* parser)
+    : Nestable<Scope>(&parser->pc_->innermostScope_),
+      declared_(parser->cx_->frontendCollectionPool()),
+      possibleAnnexBFunctionBoxes_(parser->cx_->frontendCollectionPool()),
+      id_(parser->usedNames_.nextScopeId()) {}
+
+inline ParseContext::Scope::Scope(JSContext* cx, ParseContext* pc,
+                                  UsedNameTracker& usedNames)
+    : Nestable<Scope>(&pc->innermostScope_),
+      declared_(cx->frontendCollectionPool()),
+      possibleAnnexBFunctionBoxes_(cx->frontendCollectionPool()),
+      id_(usedNames.nextScopeId()) {}
+
+inline ParseContext::VarScope::VarScope(ParserBase* parser) : Scope(parser) {
+  useAsVarScope(parser->pc_);
+}
+
+inline ParseContext::VarScope::VarScope(JSContext* cx, ParseContext* pc,
+                                        UsedNameTracker& usedNames)
+    : Scope(cx, pc, usedNames) {
+  useAsVarScope(pc);
+}
+
+inline JS::Result<Ok, ParseContext::BreakStatementError>
+ParseContext::checkBreakStatement(const ParserName* label) {
+  // Labeled 'break' statements target the nearest labeled statements (could
+  // be any kind) with the same label. Unlabeled 'break' statements target
+  // the innermost loop or switch statement.
+  if (label) {
+    auto hasSameLabel = [&label](ParseContext::LabelStatement* stmt) {
+      MOZ_ASSERT(stmt);
+      return stmt->label() == label;
+    };
+
+    if (!findInnermostStatement<ParseContext::LabelStatement>(hasSameLabel)) {
+      return mozilla::Err(ParseContext::BreakStatementError::LabelNotFound);
+    }
+
+  } else {
+    auto isBreakTarget = [](ParseContext::Statement* stmt) {
+      return StatementKindIsUnlabeledBreakTarget(stmt->kind());
+    };
+
+    if (!findInnermostStatement(isBreakTarget)) {
+      return mozilla::Err(ParseContext::BreakStatementError::ToughBreak);
+    }
+  }
+
+  return Ok();
+}
+
+inline JS::Result<Ok, ParseContext::ContinueStatementError>
+ParseContext::checkContinueStatement(const ParserName* label) {
+  // Labeled 'continue' statements target the nearest labeled loop
+  // statements with the same label. Unlabeled 'continue' statements target
+  // the innermost loop statement.
+  auto isLoop = [](ParseContext::Statement* stmt) {
+    MOZ_ASSERT(stmt);
+    return StatementKindIsLoop(stmt->kind());
+  };
+
+  if (!label) {
+    // Unlabeled statement: we target the innermost loop, so make sure that
+    // there is an innermost loop.
+    if (!findInnermostStatement(isLoop)) {
+      return mozilla::Err(ParseContext::ContinueStatementError::NotInALoop);
+    }
+    return Ok();
+  }
+
+  // Labeled statement: targest the nearest labeled loop with the same label.
+  ParseContext::Statement* stmt = innermostStatement();
+  bool foundLoop = false;  // True if we have encountered at least one loop.
+
+  for (;;) {
+    stmt = ParseContext::Statement::findNearest(stmt, isLoop);
+    if (!stmt) {
+      return foundLoop
+                 ? mozilla::Err(
+                       ParseContext::ContinueStatementError::LabelNotFound)
+                 : mozilla::Err(
+                       ParseContext::ContinueStatementError::NotInALoop);
+    }
+
+    foundLoop = true;
+
+    // Is it labeled by our label?
+    stmt = stmt->enclosing();
+    while (stmt && stmt->is<ParseContext::LabelStatement>()) {
+      if (stmt->as<ParseContext::LabelStatement>().label() == label) {
+        return Ok();
+      }
+
+      stmt = stmt->enclosing();
+    }
+  }
+}
+
+template <typename DeclaredNamePtrT>
+inline void RedeclareVar(DeclaredNamePtrT ptr, DeclarationKind kind) {
+#ifdef DEBUG
+  DeclarationKind declaredKind = ptr->value()->kind();
+  MOZ_ASSERT(DeclarationKindIsVar(declaredKind));
+#endif
+
+  // Any vars that are redeclared as body-level functions must
+  // be recorded as body-level functions.
+  //
+  // In the case of global and eval scripts, GlobalDeclaration-
+  // Instantiation [1] and EvalDeclarationInstantiation [2]
+  // check for the declarability of global var and function
+  // bindings via CanDeclareVar [3] and CanDeclareGlobal-
+  // Function [4]. CanDeclareGlobalFunction is strictly more
+  // restrictive than CanDeclareGlobalVar, so record the more
+  // restrictive kind. These semantics are implemented in
+  // CheckCanDeclareGlobalBinding.
+  //
+  // VarForAnnexBLexicalFunction declarations are declared when
+  // the var scope exits. It is not possible for a var to be
+  // previously declared as VarForAnnexBLexicalFunction and
+  // checked for redeclaration.
+  //
+  // [1] ES 15.1.11
+  // [2] ES 18.2.1.3
+  // [3] ES 8.1.1.4.15
+  // [4] ES 8.1.1.4.16
+  if (kind == DeclarationKind::BodyLevelFunction) {
+    MOZ_ASSERT(declaredKind != DeclarationKind::VarForAnnexBLexicalFunction);
+    ptr->value()->alterKind(kind);
+  }
+}
+
+}  // namespace frontend
+}  // namespace js
+
+#endif  // frontend_ParseContext_inl_h