Check that a parameter name of a function definition does not shadow an enum definition.

src/main/java/de/hsrm/compiler/Klang/ContextAnalysis.java

@@ -851,10 +851,24 @@ public class ContextAnalysis extends KlangBaseVisitor<Node> {
     var parameterName = ctx.IDENT().getText();
     var parameterType = Type.getByName(ctx.type_annotation().type().getText());
 
+    if (structDefs.containsKey(parameterName)) {
+      var line = ctx.start.getLine();
+      var col = ctx.start.getCharPositionInLine();
+      var error = "Parameter name " + parameterName + " duplicates a struct of the same name.";
+      throw new RuntimeException(Helper.getErrorPrefix(line, col) + error);
+    }
+
+    if (enumDefs.containsKey(parameterName)) {
+      var line = ctx.start.getLine();
+      var col = ctx.start.getCharPositionInLine();
+      var error = "Parameter name " + parameterName + " duplicates an enum of the same name.";
+      throw new RuntimeException(Helper.getErrorPrefix(line, col) + error);
+    }
+
     if (!parameterType.isPrimitiveType() && !structDefs.containsKey(parameterType.getName()) && !enumDefs.containsKey(parameterType.getName())) {
       var line = ctx.type_annotation().start.getLine();
       var col = ctx.type_annotation().start.getCharPositionInLine();
-      String error = "Type " + parameterType.getName() + " not defined.";
+      var error = "Type " + parameterType.getName() + " not defined.";
       throw new RuntimeException(Helper.getErrorPrefix(line, col) + error);
     }
 

src/test/java/FunctionDefinitionTest.java

@@ -77,4 +77,19 @@ public class FunctionDefinitionTest {
         var e = assertThrows(RuntimeException.class, () -> ctxAnal.visit(tree));
         assertEquals("Error in line 1:20 Function foo has to return something of type int.", e.getMessage());
     }
+
+    @Test
+    void shouldThrowExceptionIfParameterNameMatchesEnumName() {
+        // given
+        var tree = Helper.prepareParser("enum Bar { A, B } function foo(Bar: int): int { return 1; } foo(1);");
+        var ctxAnal = new ContextAnalysis(
+                Helper.getFuncs(tree),
+                Helper.getStructs(tree),
+                Helper.getEnums(tree)
+        );
+
+        // when / then
+        var e = assertThrows(RuntimeException.class, () -> ctxAnal.visit(tree));
+        assertEquals("Error in line 1:31 Parameter name Bar duplicates an enum of the same name.", e.getMessage());
+    }
 }