test: demonstrate syntax error with empty %raw

Author: anmonteiro

test/blackbox-tests/empty-raw.t

@@ -0,0 +1,42 @@
+
+  $ . ./setup.sh
+  $ cat > x.ml <<EOF
+  > [%%raw {||}]
+  > EOF
+  $ melc -ppx melppx x.ml
+  // Generated by Melange
+  
+  'use strict';
+  
+  
+  /* No side effect */
+
+  $ cat > x.ml <<EOF
+  > let () = [%raw {||}]
+  > EOF
+  $ melc -ppx melppx x.ml
+  File "x.ml", line 1, characters 17-17:
+  Warning 103 [melange-ffi-warning]: FFI warning: Unexpected end of input
+  // Generated by Melange
+  'use strict';
+  
+  
+  ();
+  /*  Not a pure module */
+
+  $ cat > x.ml <<EOF
+  > let x = [%raw {||}]
+  > EOF
+  $ melc -ppx melppx x.ml
+  File "x.ml", line 1, characters 16-16:
+  Warning 103 [melange-ffi-warning]: FFI warning: Unexpected end of input
+  // Generated by Melange
+  'use strict';
+  
+  
+  const x = ;
+  
+  module.exports = {
+    x,
+  }
+  /* x Not a pure module */