Properly split up line blocks from line block pairs

This is necessary for us to do proper pairing of line blocks since
otherwise the rejection would disallow line blocks of any type.

diff --git a/grammar.ebnf b/grammar.ebnf
index 4707c1629e891784ea7c7370027202af3127a079..95a003517c3a05f483551eb4006bba65f2c5a489 100644 (file)
--- a/grammar.ebnf
+++ b/grammar.ebnf
@@ -89,8 +89,18 @@ block_close_symbol
 \r
 line_block_expression\r
     =\r
-    | ( start:line_block_start contents:expressions end:line_block_end )\r
-    | block:line_block_start\r
+    | line_block_expression_pair\r
+    | line_block_expression_single\r
+    ;\r
+\r
+line_block_expression_pair\r
+    =\r
+    start:line_block_start contents:expressions end:line_block_end\r
+    ;\r
+\r
+line_block_expression_single\r
+    =\r
+    block:line_block_start\r
     ;\r
 \r
 line_block_start\r