Fix type issues with struct access

src/parser.cpp

@@ -73,6 +73,7 @@ namespace Solstice {
 
         std::string checkNodeReturnType(SolNode i) {
             switch (i.nodeType) {
+                case SolNodeType::In:
                 case SolNodeType::Identifier: {
                     if (variables.find(i.outputId) != variables.end()) {
                         return variables[i.outputId];

tests/struct.sols

@@ -8,4 +8,4 @@ puts e
 puts dingus
 
 puts e.x
-puts e.y
+println(e.y)