Extract modifier tests.

test/libsolidity/syntaxTests/modifiers/base_constructor_double_invocation.sol

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+contract C { function C(uint a) public {} }
+contract B is C {
+    function B() C(2) C(2) public {}
+}
+// ----
+// DeclarationError: Base constructor already provided.

test/libsolidity/syntaxTests/modifiers/constructor_call_invalid_arg_count.sol

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+// This caused a segfault in an earlier version
+contract C {
+    function C() public {}
+}
+contract D is C {
+    function D() C(5) public {}
+}
+// ----
+// TypeError: Wrong argument count for modifier invocation: 1 arguments given but expected 0.

test/libsolidity/syntaxTests/modifiers/function_modifier_double_invocation.sol

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+contract B {
+    function f(uint x) mod(x) mod(2) public pure { }
+    modifier mod(uint a) { if (a > 0) _; }
+}

test/libsolidity/syntaxTests/modifiers/function_modifier_invocation.sol

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+contract B {
+    function f() mod1(2, true) mod2("0123456") pure public { }
+    modifier mod1(uint a, bool b) { if (b) _; }
+    modifier mod2(bytes7 a) { while (a == "1234567") _; }
+}

test/libsolidity/syntaxTests/modifiers/function_modifier_invocation_local_variables.sol

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+contract B {
+    function f() mod(x) pure public { uint x = 7; }
+    modifier mod(uint a) { if (a > 0) _; }
+}

test/libsolidity/syntaxTests/modifiers/function_modifier_invocation_local_variables050.sol

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+pragma experimental "v0.5.0";
+contract B {
+    function f() mod(x) pure public { uint x = 7; }
+    modifier mod(uint a) { if (a > 0) _; }
+}
+// ----
+// DeclarationError: Undeclared identifier.

test/libsolidity/syntaxTests/modifiers/function_modifier_invocation_parameters.sol

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+contract B {
+    function f(uint8 a) mod1(a, true) mod2(r) pure public returns (bytes7 r) { }
+    modifier mod1(uint a, bool b) { if (b) _; }
+    modifier mod2(bytes7 a) { while (a == "1234567") _; }
+}

test/libsolidity/syntaxTests/modifiers/function_overrides_modifier.sol

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+contract A { function mod(uint a) public { } }
+contract B is A { modifier mod(uint a) { _; } }
+// ----
+// DeclarationError: Identifier already declared.
+// TypeError: Override changes function to modifier.

test/libsolidity/syntaxTests/modifiers/illegal_modifier_override.sol

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+contract A { modifier mod(uint a) { _; } }
+contract B is A { modifier mod(uint8 a) { _; } }
+// ----
+// TypeError: Override changes modifier signature.

test/libsolidity/syntaxTests/modifiers/invalid_function_modifier_type.sol

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+contract B {
+    function f() mod1(true) public { }
+    modifier mod1(uint a) { if (a > 0) _; }
+}
+// ----
+// TypeError: Invalid type for argument in modifier invocation. Invalid implicit conversion from bool to uint256 requested.

test/libsolidity/syntaxTests/modifiers/legal_modifier_override.sol

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+contract A { modifier mod(uint a) { _; } }
+contract B is A { modifier mod(uint a) { _; } }

test/libsolidity/syntaxTests/modifiers/modifier_overrides_function.sol

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+contract A { modifier mod(uint a) { _; } }
+contract B is A { function mod(uint a) public { } }
+// ----
+// DeclarationError: Identifier already declared.
+// TypeError: Override changes modifier to function.

test/libsolidity/syntaxTests/modifiers/modifier_returns_value.sol

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+contract A {
+    function f(uint a) mod(2) public returns (uint r) { }
+    modifier mod(uint a) { _; return 7; }
+}
+// ----
+// TypeError: Return arguments not allowed.

test/libsolidity/syntaxTests/modifiers/modifier_without_underscore.sol

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+contract test {
+    modifier m() {}
+}
+// ----
+// SyntaxError: Modifier body does not contain '_'.