Add potential void type.

Author: Moderocky

src/main/java/org/byteskript/skript/api/ModifiableLibrary.java

@@ -115,7 +115,7 @@ public void registerProperty(String name, HandlerType type, Method handler) {
         This version accepts Foundation types.
         """)
     public void registerTypes(Type... types) {
-        for (Type type : types) {
+        for (final Type type : types) {
             if (!this.types.contains(type)) this.types.add(type);
         }
     }

src/main/java/org/byteskript/skript/compiler/FileContext.java

@@ -54,6 +54,7 @@ public FileContext(Type type) {
             .addModifiers(Modifier.FINAL)
             .setSuperclass(CompiledScript.class);
         this.addSkriptFunctions();
+        this.registerType("none", new Type(void.class)); // special overridden case
 //        writer.setComputation(1); // todo
     }
 
@@ -420,7 +421,7 @@ public LanguageElement getExpected() {
 
     @Override
     public void registerType(String name, Type type) {
-        types.put(name, type);
+        this.types.put(name, type);
     }
 
     @Override

src/main/java/org/byteskript/skript/compiler/SkriptLangSpec.java

@@ -100,7 +100,7 @@ public final class SkriptLangSpec extends ModifiableLibrary implements LanguageD
 
     private SkriptLangSpec() {
         super("Skript");
-        registerTypes(
+        this.registerTypes(
             CommonTypes.CLASS,
             CommonTypes.TYPE,
             CommonTypes.INTEGER,

src/test/java/org/byteskript/skript/test/TypesTest.java

@@ -23,12 +23,20 @@ public static void start() throws Throwable {
         final PostCompileClass[] classes = skript.compileComplexScript(TypesTest.class.getClassLoader()
             .getResourceAsStream("types.bsk"), "skript.types");
         for (PostCompileClass cls : classes) {
+            debug(cls);
             if (script == null)
                 script = skript.loadScript(cls);
             else skript.loadScript(cls);
         }
     }
 
+    @Test
+    public void runnable() throws Throwable {
+        final Member function = script.getFunction("runnable");
+        assert function != null;
+        function.run(skript).get();
+    }
+    
     @Test
     public void basic_use() throws Throwable {
         final Member function = script.getFunction("basic_use");

src/test/resources/types.bsk

@@ -97,3 +97,18 @@ function java_implement:
         assert {var} is "hello": "Supplier get method failed."
         set {var} to result of {getter}
         assert {var} is "hello": "Supplier result-of failed."
+
+type Runnable:
+    template: java/lang/Runnable
+    function run:
+        return: none
+        trigger:
+            assert {_var} is 1: "Variable failed to transfer."
+            set {_var} to 2
+
+function runnable:
+    trigger:
+        set {thing} to a new Runnable
+        set {_var} to 1
+        run {thing}
+        assert {_var} is 2: "Runnable failed to run."