minimal working grammar

corpus/shebang_only.txt

@@ -0,0 +1,14 @@
+==================
+nix-shell shebang without any interpreter option
+==================
+
+#!/usr/bin/env nix-shell
+---
+
+(source_file
+  (first_line
+    (shebang_open)
+    (opt_ws)
+    (env)
+    (ws)
+    (nix_shell)))

corpus/shebang_with_sub_interpreter.txt

@@ -0,0 +1,22 @@
+==================
+Minimal nix-shell invocation
+==================
+
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash
+---
+
+(source_file
+  (first_line
+    (shebang_open)
+    (opt_ws)
+    (env)
+    (ws)
+    (nix_shell))
+  (non_first_line
+    (newline)
+    (annotation_line
+      (shebang_open)
+      (opt_ws)
+      (nix_shell)
+      (nix_shell_args))))