hg: jdk10/sandbox/langtools: 8180510: jshell tool: crash on entering pseudo-commands: /<id> or /-<n>

[chris.hegarty at oracle.com]

Changeset: dd1e024fc434
Author:    rfield
Date:      2017-06-16 10:32 -0700
URL:       http://hg.openjdk.java.net/jdk10/sandbox/langtools/rev/dd1e024fc434

8180510: jshell tool: crash on entering pseudo-commands: /<id> or /-<n>
Reviewed-by: jlahoda

! src/jdk.jshell/share/classes/jdk/internal/jshell/tool/JShellTool.java
! test/jdk/jshell/ToolSimpleTest.java