forgot to support explicit enum type

lang/src/son.rs

@@ -2877,6 +2877,32 @@ impl<'a> Codegen<'a> {
                     };
                 }
 
+                if let ty::Kind::Enum(e) = tty.expand() {
+                    let intrnd = self.tys.names.project(name);
+                    let Some(index) =
+                        self.tys.enum_fields(e).iter().position(|f| Some(f.name) == intrnd)
+                    else {
+                        let field_list = self
+                            .tys
+                            .enum_fields(e)
+                            .iter()
+                            .map(|f| self.tys.names.ident_str(f.name))
+                            .intersperse("', '")
+                            .collect::<String>();
+                        self.report(
+                            pos,
+                            fa!(
+                                "the '{}' does not have this variant, \
+                            but it does have '{field_list}'",
+                                self.ty_display(tty)
+                            ),
+                        );
+                        return Value::NEVER;
+                    };
+
+                    return Some(self.ci.nodes.new_const_lit(tty, index as i64));
+                }
+
                 let ty::Kind::Struct(s) = self.tys.base_of(tty).unwrap_or(tty).expand() else {
                     self.report(
                         pos,