refactor: make functions non-semantic types

src/main/wacc/Error.scala

@@ -5,7 +5,9 @@ import wacc.types._
 
 enum Error {
   case DuplicateDeclaration(ident: ast.Ident)
-  case UndefinedIdentifier(ident: ast.Ident, identType: renamer.IdentType)
+  case UndeclaredVariable(ident: ast.Ident)
+  case UndefinedFunction(ident: ast.Ident)
+
   case FunctionParamsMismatch(pos: Position, expected: Int, got: Int)
   case SemanticError(pos: Position, msg: String)
   case TypeMismatch(pos: Position, expected: SemType, got: SemType, msg: String)
@@ -19,9 +21,13 @@ def printError(error: Error)(using errorContent: String): Unit = {
       printPosition(ident.pos)
       println(s"Duplicate declaration of identifier ${ident.v}")
       highlight(ident.pos, ident.v.length)
-    case Error.UndefinedIdentifier(ident, identType) =>
+    case Error.UndeclaredVariable(ident) =>
       printPosition(ident.pos)
-      println(s"Undefined ${identType.toString.toLowerCase()} ${ident.v}")
+      println(s"Undeclared variable ${ident.v}")
+      highlight(ident.pos, ident.v.length)
+    case Error.UndefinedFunction(ident) =>
+      printPosition(ident.pos)
+      println(s"Undefined function ${ident.v}")
       highlight(ident.pos, ident.v.length)
     case Error.FunctionParamsMismatch(pos, expected, got) =>
       printPosition(pos)