docs(tools/repl): add special variables section (denoland#8057)

nayeemrmn · Oct 21, 2020 · 322913e · 322913e
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diff --git a/docs/tools/repl.md b/docs/tools/repl.md
@@ -43,3 +43,10 @@ up program state in the global context.
 | Meta-T                | Transpose words                                                                                  |
 | Meta-U                | Upper-case the next word                                                                         |
 | Meta-Y                | See Ctrl-Y                                                                                       |
+
+## Special variables
+
+| Identifier | Description                          |
+| ---------- | ------------------------------------ |
+| _          | Yields the last evaluated expression |
+| _error     | Yields the last thrown error         |