diff --git a/packages/syntax/babel_parser_suffix.js b/packages/syntax/babel_parser_suffix.js
index aa630f2..5c76a24 100644
--- a/packages/syntax/babel_parser_suffix.js
+++ b/packages/syntax/babel_parser_suffix.js
@@ -1,5 +1,6 @@
-// Horrible, horrible, horrible, horrible hack to get hold of the Parser
-// from babel-parser/src/parser/index.js.
+// Horrible, horrible, horrible, horrible hack to get hold of (a) the
+// Parser and (b) various flags and non-exported values from
+// babel-parser/src/parser/index.js.
 
 exports._original_Parser = Parser;
 exports.__getParser = function () {
@@ -8,3 +9,5 @@ exports.__getParser = function () {
 exports.__setParser = function (newParser) {
   Parser = newParser;
 };
+
+exports.BIND_LEXICAL = BIND_LEXICAL;
diff --git a/packages/syntax/src/parser.js b/packages/syntax/src/parser.js
index c4bbb83..f1c13f6 100644
--- a/packages/syntax/src/parser.js
+++ b/packages/syntax/src/parser.js
@@ -16,7 +16,7 @@
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 //---------------------------------------------------------------------------
 
-import { _original_Parser, tokTypes as tt } from "@babel/parser";
+import { _original_Parser, BIND_LEXICAL, tokTypes as tt } from "@babel/parser";
 
 export default class SyndicateParser extends _original_Parser {
   // Overrides ExpressionParser.parseMaybeAssign
@@ -141,6 +141,7 @@ export default class SyndicateParser extends _original_Parser {
                 this.eatContextual("type");
                 if (!this.match(tt.name)) { this.unexpected(null, tt.name); }
                 node.id = this.parseIdentifier();
+                this.scope.declareName(node.id.name, BIND_LEXICAL, node.id.start);
                 this.parseFunctionParams(node); // eww
                 node.formals = node.params;
                 delete node.params; // eww