Re: Inconsistent Multiline String Handling in Lua REPL (Direct Input vs. History Recall)

> In Lua REPL, direct input of multiline strings fails with a syntax error, 
> while recalling the same input via history navigation (up arrow) executes 
> correctly. This behavior is observed starting from Lua 5.3.x. In Lua 5.2.4, 
> history navigation as a feature did not exist, so the issue cannot be 
> verified in earlier versions.

This is documented behavior:

    In interactive mode, Lua repeatedly prompts and waits for a line.
    After reading a line, Lua first tries to interpret the line as an
    expression.  If it succeeds, it prints its value.  Otherwise, it
    interprets the line as a chunk.  If you write an incomplete chunk,
    the interpreter waits for its completion by issuing a different
    prompt.

Note the "tries to interpret THE LINE as an expression" and "If you
write an incomplete CHUNK": Lua only accepts entire chunks as multiline
input; it does not accept expressions. So,

  > a = 10 +
  >> 20

works, but

  > 10 +
  >> 20

doesn't.

The idiosyncrasy is the fact that it accepts when it comes through
history navigation; it is because then the input, although having
multiple lines, is not really a "multiline" input (e.g., no different
prompt); it goes all in one step.

-- Roberto

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