Re-added symbol table infra

src/schala_lang/mod.rs

@@ -69,6 +69,12 @@ impl ProgrammingLanguageInterface for Schala {
       }
     };
 
+    self.type_context.add_top_level_types(&ast);
+    if options.debug_symbol_table {
+      let text = self.type_context.debug_symbol_table();
+      output.add_artifact(TraceArtifact::new("symbol_table", text));
+    }
+
     match self.type_context.type_check_ast(&ast) {
       Ok(ty) => {
         output.add_artifact(TraceArtifact::new("type_check", format!("{:?}", ty)));

src/schala_lang/typechecking.rs

@@ -50,6 +50,19 @@ impl TypeContext {
   pub fn new() -> TypeContext {
     TypeContext { bindings: HashMap::new() }
   }
+}
+
+impl TypeContext {
+  pub fn add_top_level_types(&mut self, ast: &parsing::AST) {
+
+
+  }
+  pub fn debug_symbol_table(&self) -> String {
+    format!("Symbols: {:?}", self.bindings)
+  }
+}
+
+impl TypeContext {
   pub fn type_check_ast(&mut self, ast: &parsing::AST) -> TypeResult<Type> {
     use self::Type::*; use self::TConst::*;
     let mut ret_type = Const(Unit);