[EXT] Re: With beamer, "Missing { inserted." (regression)

[David Carlisle]

On Fri, 18 Feb 2022 at 09:13, Philip Taylor (Royal Holloway) <
P.Taylor at rhul.ac.uk> wrote:

> On 18/02/2022 09:05, Joseph Wright wrote:
>
> Lamport's book is entirely clear on the supported syntax for sub- and
> superscripts.
>
> As I have said before, it is a great pity that Leslie Lamport did not
> create an entirely different syntax for LaTeX, such that a naïve user
> could not possibly confuse the syntax rules for TeX with those for LaTeX.
>
That really isn't an issue here though, there is no reason to suppose this
hypothetical naive latex user should know plain tex syntax at all and
especially not have read the texbook in such detail as to understand the
parsing differences between macro arguments and subscripts, such that
\fbox\textnormal{x}  parses as \fbox{\textnormal}{x} and is an error but
e_\textnormal{x} parses as e_{\undocumentedinternalmacros{x}}  so makes a
valid subscript

David

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> *Philip Taylor*
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