Const variables not recognised as variable definition

[ghost]

If a script-local variable is defined with const, it is not recognized as a variable definition, e.g. a file test.vim with the content

const s:aa = 1
echomsg s:aa

yields as output of vint -w test.vim

test.vim:1:7: Undefined variable: s:aa (see :help E738)
test.vim:2:9: Undefined variable: s:aa (see :help E738)

Replacing const with let lets the warning go away. Likewise using aa instead of s:aa as variable name solves it, too.

My guess is that const x = y is not recognised as a definition.
I have no clue how vint works but if I add the following the warning vanishes:

--- a/vint/ast/plugin/scope_plugin/identifier_classifier.py
+++ b/vint/ast/plugin/scope_plugin/identifier_classifier.py
@@ -26,6 +26,7 @@ DECLARING_IDENTIFIERS = 'VINT:declaring_identifiers'
 
 DeclarativeNodeTypes = {
     NodeType.LET: True,
+    NodeType.CONST: True,
     NodeType.FUNCTION: True,
     NodeType.FOR: True,
     NodeType.EXCMD: True,
@@ -463,6 +464,18 @@ class IdentifierClassifier(object):
         )
 
 
+    def _enter_const_node(self, const_node, is_on_lambda_body, is_on_lambda_str):
+        # Only "=" operator can be used as declaration.
+        if const_node['op'] != '=':
+            return
+
+        self._enter_assignment_node(
+            const_node,
+            is_on_lambda_str=is_on_lambda_str,
+            is_on_lambda_body=is_on_lambda_body,
+        )
+
+
     def _enter_for_node(self, for_node, is_on_lambda_body, is_on_lambda_str):
         self._enter_assignment_node(
             for_node,
@@ -526,6 +539,13 @@ class IdentifierClassifier(object):
                 is_on_lambda_body=is_on_lambda_body,
             )
 
+        elif node_type is NodeType.CONST:
+            self._enter_const_node(
+                node,
+                is_on_lambda_str=is_on_lambda_str,
+                is_on_lambda_body=is_on_lambda_body,
+            )
+
         elif node_type is NodeType.FOR:
             self._enter_for_node(
                 node,

Remark: _enter_const_node() is exactly the same as _enter_let_node()
(except a variable name).

Note: There is also a DeclarativeNodeTypes in vint/ast/plugin/scope_plugin/scope_linker.py but that seems unused. So maybe that should be removed.