Start work on typechecking

schala-lang/src/schala.rs

@@ -88,8 +88,7 @@ impl<'a> Schala<'a> {
         self.timings.push(("symbol_table", sw.elapsed()));
 
         // Typechecking
-        // TODO typechecking not working
-        //let _overall_type = self.type_context.typecheck(&ast).map_err(SchalaError::from_type_error);
+        let _overall_type = self.type_context.typecheck(&ast).map_err(SchalaError::from_type_error);
 
         let sw = Stopwatch::start_new();
         let reduced_ir = reduced_ir::reduce(&ast, &self.symbol_table, &self.type_context);

schala-lang/src/type_inference/mod.rs

@@ -1,7 +1,7 @@
 use std::{collections::HashMap, convert::From};
 
 use crate::{
-    ast::TypeIdentifier,
+    ast::{TypeIdentifier, AST},
     identifier::{define_id_kind, Id, IdStore},
 };
 
@@ -96,6 +96,11 @@ impl TypeContext {
     pub fn lookup_type(&self, type_id: &TypeId) -> Option<&DefinedType> {
         self.defined_types.get(type_id)
     }
+
+    //TODO return some kind of overall type later?
+    pub fn typecheck(&mut self, ast: &AST) -> Result<(), TypeError> {
+        Ok(())
+    }
 }
 
 /// A type defined in program source code, as opposed to a builtin.