Free functions.

test/libsolidity/syntaxTests/freeFunctions/free_call_via_contract_type.sol

@@ -0,0 +1,8 @@
+contract C {
+    function f() public pure {}
+}
+function fun() {
+    C.f();
+}
+// ----
+// TypeError 3419: (68-73): Cannot call function via contract type name.

test/libsolidity/syntaxTests/freeFunctions/free_constructor.sol

@@ -0,0 +1,3 @@
+constructor() {}
+// ----
+// ParserError 7858: (0-11): Expected pragma, import directive or contract/interface/library/struct/enum/function definition.

test/libsolidity/syntaxTests/freeFunctions/free_fallback.sol

@@ -0,0 +1,3 @@
+fallback(){}
+// ----
+// ParserError 7858: (0-8): Expected pragma, import directive or contract/interface/library/struct/enum/function definition.

test/libsolidity/syntaxTests/freeFunctions/free_function_modifier.sol

@@ -0,0 +1,4 @@
+function fun() someModifier {
+}
+// ----
+// DeclarationError 7576: (15-27): Undeclared identifier.

test/libsolidity/syntaxTests/freeFunctions/free_function_qualified_modifier.sol

@@ -0,0 +1,9 @@
+contract C {
+  modifier someModifier() { _; }
+}
+
+function fun() C.someModifier {
+
+}
+// ----
+// ParserError 2314: (65-66): Expected '{' but got '.'

test/libsolidity/syntaxTests/freeFunctions/free_function_shadowing.sol

@@ -0,0 +1,9 @@
+function f() {}
+contract C {
+  function f() public {}
+  function g() public {
+    f();
+  }
+}
+// ----
+// Warning 2519: (31-53): This declaration shadows an existing declaration.

test/libsolidity/syntaxTests/freeFunctions/free_function_visibility.sol

@@ -0,0 +1,5 @@
+function fun1() public { }
+function fun2() internal { }
+// ----
+// SyntaxError 4126: (0-26): Free functions cannot have visibility.
+// SyntaxError 4126: (27-55): Free functions cannot have visibility.

test/libsolidity/syntaxTests/freeFunctions/free_function_without_body.sol

@@ -0,0 +1,3 @@
+function f();
+// ----
+// TypeError 4668: (0-13): Free functions must be implemented.

test/libsolidity/syntaxTests/freeFunctions/free_functions.sol

@@ -0,0 +1,4 @@
+function fun(uint256, uint[] calldata _x, uint[] storage _y) view  returns (uint, uint[] calldata) {
+	return (_y[0], _x);
+}
+// ----

test/libsolidity/syntaxTests/freeFunctions/free_mutability.sol

@@ -0,0 +1,8 @@
+function f() {
+    uint x = 2;
+    x;
+}
+function g(uint[] storage x) pure { x[0] = 1; }
+// ----
+// Warning 2018: (0-39): Function state mutability can be restricted to pure
+// TypeError 8961: (76-80): Function declared as pure, but this expression (potentially) modifies the state and thus requires non-payable (the default) or payable.

test/libsolidity/syntaxTests/freeFunctions/free_overload.sol

@@ -0,0 +1,9 @@
+function f(uint) returns (bytes memory) {}
+function f(uint[] memory x) returns (bytes memory) { return f(x[0]); }
+function g(uint8) {}
+function g(uint16) {}
+function t() {
+    g(2);
+}
+// ----
+// TypeError 4487: (176-177): No unique declaration found after argument-dependent lookup.

test/libsolidity/syntaxTests/freeFunctions/free_override.sol

@@ -0,0 +1,4 @@
+function fun() override {
+}
+// ----
+// SyntaxError 1750: (0-27): Free functions cannot override.

test/libsolidity/syntaxTests/freeFunctions/free_payable.sol

@@ -0,0 +1,4 @@
+function fun() payable {
+}
+// ----
+// TypeError 9559: (0-26): Free functions cannot be payable.

test/libsolidity/syntaxTests/freeFunctions/free_receive.sol

@@ -0,0 +1,3 @@
+receive() {}
+// ----
+// ParserError 7858: (0-7): Expected pragma, import directive or contract/interface/library/struct/enum/function definition.

test/libsolidity/syntaxTests/freeFunctions/free_storage.sol

@@ -0,0 +1,4 @@
+struct S { uint x; }
+function fun(S storage) {
+}
+// ----

test/libsolidity/syntaxTests/freeFunctions/free_virtual.sol

@@ -0,0 +1,4 @@
+function fun() virtual {
+}
+// ----
+// SyntaxError 4493: (0-26): Free functions cannot be virtual.

test/libsolidity/syntaxTests/freeFunctions/function_same_name_as_contract.sol

@@ -0,0 +1,4 @@
+contract C {}
+function C() {}
+// ----
+// DeclarationError 2333: (14-29): Identifier already declared.

test/libsolidity/syntaxTests/freeFunctions/function_using_struct_after_contract.sol

@@ -0,0 +1,6 @@
+contract C {
+    struct S { uint x; }
+}
+function f() returns (uint) { S storage t; }
+// ----
+// DeclarationError 7920: (70-71): Identifier not found or not unique.

test/libsolidity/syntaxTests/freeFunctions/gas_value.sol

@@ -0,0 +1,6 @@
+function fun() {
+    fun{gas: 1}();
+    fun{value: 1}();
+}
+// ----
+// TypeError 2193: (21-32): Function call options can only be set on external function calls or contract creations.

test/libsolidity/syntaxTests/freeFunctions/qualified_struct_access.sol

@@ -0,0 +1,7 @@
+function f() returns (uint) { C.S storage t; t.x; }
+
+contract C {
+    struct S { uint x; }
+}
+// ----
+// TypeError 3464: (45-46): This variable is of storage pointer type and can be accessed without prior assignment, which would lead to undefined behaviour.

test/libsolidity/syntaxTests/freeFunctions/struct_after_function.sol

@@ -0,0 +1,3 @@
+function f(S storage g) view returns (uint) { S storage t = g; return t.x; }
+struct S { uint x; }
+// ----

test/libsolidity/syntaxTests/freeFunctions/super_in_free_function.sol

@@ -0,0 +1,6 @@
+contract C {}
+function f() {
+    super;
+}
+// ----
+// DeclarationError 7576: (33-38): Undeclared identifier. "super" is not (or not yet) visible at this point.

test/libsolidity/syntaxTests/freeFunctions/this_in_free_function.sol

@@ -0,0 +1,6 @@
+contract C {}
+function f() {
+    this;
+}
+// ----
+// DeclarationError 7576: (33-37): Undeclared identifier. "this" is not (or not yet) visible at this point.

test/libsolidity/syntaxTests/imports/importing_free_functions.sol

@@ -0,0 +1,14 @@
+==== Source: a ====
+function f(uint x) pure returns (uint) { return x * 3; }
+==== Source: b ====
+import "a" as A;
+function g(uint x) pure returns (uint) { return A.f(x) * 3; }
+==== Source: c ====
+import "b" as B;
+contract C {
+    function f() public pure {
+        B.g(2);
+        B.A.f(3);
+    }
+}
+// ----