Print returns in function types at the end (#333)

Author: fvictorio

Foo.sol

@@ -0,0 +1,15 @@
+contract FunctionTypes {
+    struct Something {
+        function (address) external view   returns (uint256) getSomething;
+    }
+
+function reduce(
+        uint256[] memory self, 
+        function  (uint256, uint256) pure   returns (uint256) f
+    ) internal pure returns (uint256 r) {
+        r = self[0];
+        for (uint256 i = 1; i < self.length; i++) {
+            r = f(r, self[i]);
+        }
+    }
+}

src/nodes/FunctionTypeName.js

@@ -35,9 +35,9 @@ const FunctionTypeName = {
       indent(
         group(
           concat([
-            returnTypes(node, path, print),
             visibility(node),
-            stateMutability(node)
+            stateMutability(node),
+            returnTypes(node, path, print)
           ])
         )
       )

tests/AllSolidityFeatures/AllSolidityFeatures.sol

@@ -486,3 +486,19 @@ contract ConstructorWithoutVisibility {
     x = _x;
   }
 }
+
+contract FunctionTypes {
+    struct Something {
+        function (address) external view   returns (uint256) getSomething;
+    }
+
+function reduce(
+        uint256[] memory self, 
+        function  (uint256, uint256) pure   returns (uint256) f
+    ) internal pure returns (uint256 r) {
+        r = self[0];
+        for (uint256 i = 1; i < self.length; i++) {
+            r = f(r, self[i]);
+        }
+    }
+}

tests/AllSolidityFeatures/__snapshots__/jsfmt.spec.js.snap

@@ -489,6 +489,22 @@ contract ConstructorWithoutVisibility {
     x = _x;
   }
 }
+
+contract FunctionTypes {
+    struct Something {
+        function (address) external view   returns (uint256) getSomething;
+    }
+
+function reduce(
+        uint256[] memory self, 
+        function  (uint256, uint256) pure   returns (uint256) f
+    ) internal pure returns (uint256 r) {
+        r = self[0];
+        for (uint256 i = 1; i < self.length; i++) {
+            r = f(r, self[i]);
+        }
+    }
+}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 // Examples taken from the Solidity documentation online.
 
@@ -1028,4 +1044,20 @@ contract ConstructorWithoutVisibility {
     }
 }
 
+contract FunctionTypes {
+    struct Something {
+        function(address) external view returns (uint256) getSomething;
+    }
+
+    function reduce(
+        uint256[] memory self,
+        function(uint256, uint256) pure returns (uint256) f
+    ) internal pure returns (uint256 r) {
+        r = self[0];
+        for (uint256 i = 1; i < self.length; i++) {
+            r = f(r, self[i]);
+        }
+    }
+}
+
 `;