Reported by Paul Deitel.

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jshell> int x = 1
x ==> 1

jshell> int y = 3
y ==> 3

jshell> if (x < y) {
   ...> printf("%d is less than %d", x, y);
   ...> }
1 is less than 3
jshell> /list

   1 : int x = 1;
   2 : int y = 3;
   3 : if (x < y) {
          printf("%d is less than %d", x, y);
       }

jshell> /drop 3
| This command does not accept the snippet '3' : if (x < y) {
| printf("%d is less than %d", x, y);
| }
| See /types, /methods, /vars, or /list

jshell> /list 3

   3 : if (x < y) {
          printf("%d is less than %d", x, y);
       }

jshell> /drop 1
| dropped variable x

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The message should be clearer why it is not accepted.

OR, though it does not effect execution state, drop of a statement (at the API level) could/should just change the status of the Snippet as it does for DeclarationSnippets.