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doc: warn about reassigning _ in REPL #3729

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doc: warn about reassigning _ in REPL #3729

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3 changes: 3 additions & 0 deletions doc/api/repl.markdown
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Expand Up @@ -219,6 +219,9 @@ The special variable `_` (underscore) contains the result of the last expression
> _ += 1
4

*NOTE*: Explicitly assigning a value to `_` in the REPL can produce unexpected
results.

The REPL provides access to any variables in the global scope. You can expose
a variable to the REPL explicitly by assigning it to the `context` object
associated with each `REPLServer`. For example:
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