Re: Inconsistent Multiline String Handling in Lua REPL (Direct Input vs. History Recall)
mjmouse9999 <[email protected]> Thu, 30 Jul 2026 06:17:11 -0700 (PDT)
| Newsgroups | gmane.comp.lang.lua.general |
|---|---|
| Message-ID | <[email protected]> |
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On Thursday, July 30, 2026 at 10:08:55PM mathieu stumpf-guntz wrote:
> Hello dear Lua community,
>
> 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.
>
> Steps to Reproduce:
> 1. Launch Lua REPL (tested versions: 5.2.4, 5.3.6, 5.5.0).
Your results indicate that you launched it with the input not being attached
to a tty, similar to:
$ lua <<< $'[[\ntest\n]]\n'
lua: stdin:3: unexpected symbol near '[[test
]]'
> 2. Input a multiline string directly:
> > [[ \ntest\n]]
> Output: stdin:3: unexpected symbol near '[[test\n]]' (error in all
tested versions).
>
> 3. Press the up arrow to recall and re-execute the same input.
>
> [...]
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On Thursday, July 30, 2026 at 10:08:55PM mathieu stumpf-guntz wrote:<br />&=
gt; Hello dear Lua community,<br />><br />> In Lua REPL, direct input=
of multiline strings fails with a syntax error,<br />> while recalling =
the same input via history navigation (up arrow) executes<br />> correct=
ly. This behavior is observed starting from Lua 5.3.x. In Lua 5.2.4,<br />&=
gt; history navigation as a feature did not exist, so the issue cannot be<b=
r />> verified in earlier versions.<br />><br />> Steps to Reprodu=
ce:<br />> =C2=A01. Launch Lua REPL (tested versions: 5.2.4, 5.3.6, 5.5.=
0).<br /><br />Your results indicate that you launched it with the input no=
t being attached<br />to a tty, similar to:<br /><br />=C2=A0 =C2=A0 $ lua =
<<< $'[[\ntest\n]]\n'<br />=C2=A0 =C2=A0 lua: stdin:3: unexpected =
symbol near '[[test<br />=C2=A0 =C2=A0 ]]'<br /><br />> =C2=A02. Input a=
multiline string directly:<br />> =C2=A0 =C2=A0 > [[ \ntest\n]]<br /=
>> =C2=A0 =C2=A0 Output: stdin:3: unexpected symbol near '[[test\n]]' (e=
rror in all tested versions).<br />><br />> =C2=A03. Press the up arr=
ow to recall and re-execute the same input.<br />><br />> [...]<br />
<p></p>
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lua-l/14d5db8b-2f85-4b6d-8bf1-807dddec2aafn%40googlegroups.com?utm_medium=
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