From 5257f5e720709c02579e2db402d0a0ea1d6f9fdc Mon Sep 17 00:00:00 2001
From: Alex Beregszaszi <alex@rtfs.hu>
Date: Wed, 27 Sep 2017 14:11:44 +0100
Subject: [PATCH] Do not add members of address to contracts in experimental
 0.5.0

---
 Changelog.md                                  |  1 +
 docs/types.rst                                |  3 +
 libsolidity/ast/Types.cpp                     |  6 +-
 .../SolidityNameAndTypeResolution.cpp         | 58 +++++++++++++++++++
 4 files changed, 66 insertions(+), 2 deletions(-)

diff --git a/Changelog.md b/Changelog.md
index 8ebc30d051f3..c9da5aaa8822 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -4,6 +4,7 @@ Features:
  * Parser: Better error message for unexpected trailing comma in parameter lists.
  * Syntax Checker: Unary ``+`` is now a syntax error as experimental 0.5.0 feature.
  * Type Checker: Disallow non-pure constant state variables as experimental 0.5.0 feature.
+ * Type Checker: Do not add members of ``address`` to contracts as experimental 0.5.0 feature.
 
 Bugfixes:
  * Parser: Fix source location of VariableDeclarationStatement.
diff --git a/docs/types.rst b/docs/types.rst
index 5c291f35d8a9..ebc753a0d204 100644
--- a/docs/types.rst
+++ b/docs/types.rst
@@ -107,6 +107,9 @@ Operators:
 
 * ``<=``, ``<``, ``==``, ``!=``, ``>=`` and ``>``
 
+.. note::
+    Starting with version 0.5.0 contracts do not derive from the address type, but can still be explicitly converted to address.
+
 .. _members-of-addresses:
 
 Members of Addresses
diff --git a/libsolidity/ast/Types.cpp b/libsolidity/ast/Types.cpp
index a39b57758d5e..b560f9c903eb 100644
--- a/libsolidity/ast/Types.cpp
+++ b/libsolidity/ast/Types.cpp
@@ -1616,7 +1616,7 @@ string ContractType::canonicalName() const
 	return m_contract.annotation().canonicalName;
 }
 
-MemberList::MemberMap ContractType::nativeMembers(ContractDefinition const*) const
+MemberList::MemberMap ContractType::nativeMembers(ContractDefinition const* _contract) const
 {
 	MemberList::MemberMap members;
 	if (m_super)
@@ -1660,7 +1660,9 @@ MemberList::MemberMap ContractType::nativeMembers(ContractDefinition const*) con
 				&it.second->declaration()
 			));
 	}
-	addNonConflictingAddressMembers(members);
+	// In 0.5.0 address members are not populated into the contract.
+	if (m_contract.sourceUnit().annotation().experimentalFeatures.count(ExperimentalFeature::V050))
+		addNonConflictingAddressMembers(members);
 	return members;
 }
 
diff --git a/test/libsolidity/SolidityNameAndTypeResolution.cpp b/test/libsolidity/SolidityNameAndTypeResolution.cpp
index ed2236784af3..ea049001ec5e 100644
--- a/test/libsolidity/SolidityNameAndTypeResolution.cpp
+++ b/test/libsolidity/SolidityNameAndTypeResolution.cpp
@@ -7089,6 +7089,64 @@ BOOST_AUTO_TEST_CASE(array_length_validation)
 	CHECK_ERROR(text, TypeError, "Invalid array length, expected integer literal.");
 }
 
+BOOST_AUTO_TEST_CASE(no_address_members_on_contract)
+{
+	char const* text = R"(
+		pragma experimental "v0.5.0";
+		contract C {
+			function f() {
+				this.balance;
+			}
+		}
+	)";
+	CHECK_ERROR(text, TypeError, "Member \"balance\" not found or not visible after argument-dependent lookup in contract");
+	text = R"(
+		pragma experimental "v0.5.0";
+		contract C {
+			function f() {
+				this.transfer;
+			}
+		}
+	)";
+	CHECK_ERROR(text, TypeError, "Member \"transfer\" not found or not visible after argument-dependent lookup in contract");
+	text = R"(
+		pragma experimental "v0.5.0";
+		contract C {
+			function f() {
+				this.send;
+			}
+		}
+	)";
+	CHECK_ERROR(text, TypeError, "Member \"send\" not found or not visible after argument-dependent lookup in contract");
+	text = R"(
+		pragma experimental "v0.5.0";
+		contract C {
+			function f() {
+				this.call;
+			}
+		}
+	)";
+	CHECK_ERROR(text, TypeError, "Member \"call\" not found or not visible after argument-dependent lookup in contract");
+	text = R"(
+		pragma experimental "v0.5.0";
+		contract C {
+			function f() {
+				this.callcode;
+			}
+		}
+	)";
+	CHECK_ERROR(text, TypeError, "Member \"callcode\" not found or not visible after argument-dependent lookup in contract");
+	text = R"(
+		pragma experimental "v0.5.0";
+		contract C {
+			function f() {
+				this.delegatecall;
+			}
+		}
+	)";
+	CHECK_ERROR(text, TypeError, "Member \"delegatecall\" not found or not visible after argument-dependent lookup in contract");
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 
 }