d: fix interface syntax error

Fix syntax error regarding interface inheritance of the Lexer. It
appeared when the `%code lexer` option was used.

Reported by ledaniel2.
<https://github.com/akimd/bison/issues/84>

* data/skeletons/lalr1.d: Fix syntax.
* tests/d.at: Test it.

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/d.at b/tests/d.at
index 6be53eef..347e868c 100644
--- a/tests/d.at
+++ b/tests/d.at
@@ -112,6 +112,13 @@ AT_CHECK_D_GREP([[class YYParser : BaseClass]])
 AT_CHECK_D_MINIMAL([%define api.parser.extends {Interface}], [], [], [interface Interface {}])
 AT_CHECK_D_GREP([[class YYParser : Interface]])
 
+AT_CHECK_D_MINIMAL([%code lexer
+{
+  Symbol yylex () {return Symbol();}
+  void yyerror (string s) {import std.stdio;writeln(s);}
+}], [], [], [])
+AT_CHECK_D_GREP([[private class YYLexer: Lexer]])
+
 AT_CHECK_D_MINIMAL(
 [%define api.parser.extends {BaseClass}
 %define api.parser.implements {Interface}], [], [],