Fix corner case when typechecking scoped names with static compilation (#392)

* Fix corner case when typechecking scoped names with static compilation

* Undo log

---------

Co-authored-by: Ibrahim Numanagić <ibrahimpasa@gmail.com>

codon/parser/visitors/translate/translate.cpp

@@ -372,6 +372,10 @@ void TranslateVisitor::visit(AssignStmt *stmt) {
     auto isGlobal = in(ctx->cache->globals, var);
     ir::Var *v = nullptr;
 
+    // dead declaration due to static compilation
+    if (!stmt->rhs && !stmt->type && !stmt->lhs->type->getClass())
+      return;
+
     if (isGlobal) {
       seqassert(ctx->find(var) && ctx->find(var)->getVar(), "cannot find global '{}'",
                 var);

codon/parser/visitors/typecheck/assign.cpp

@@ -64,7 +64,7 @@ void TypecheckVisitor::visit(AssignStmt *stmt) {
             ctx->instantiate(stmt->type->getSrcInfo(), stmt->type->getType()));
     }
     ctx->add(TypecheckItem::Var, lhs, stmt->lhs->type);
-    if (realize(stmt->lhs->type))
+    if (realize(stmt->lhs->type) || !stmt->type)
       stmt->setDone();
   } else if (stmt->type && stmt->type->getType()->isStaticType()) {
     // Static assignments (e.g., `x: Static[int] = 5`)

stdlib/internal/core.codon

@@ -7,6 +7,11 @@ class __internal__:
 class __magic__:
     pass
 
+@tuple
+@__internal__
+class NoneType:
+    pass
+
 @tuple
 @__internal__
 @__notuple__
@@ -40,11 +45,6 @@ class float32:
     MIN_10_EXP = -37
     pass
 
-@tuple
-@__internal__
-class NoneType:
-    pass
-
 @tuple
 @__internal__
 class type: