With beamer, "Missing { inserted." (regression)

[Philip Taylor (Hellenic Institute)]

On 18/02/2022 10:58, Zdenek Wagner wrote:
> Just to be precise, the information that x^\frac{a}{b} does not need
> braces is based upon a wrong assumption. The official manual says what
> \frac is supposed to yield in the printed output but does not say how
> it should be implemented. This means that in the future the LaTeX
> developers may freely change the definition and it will need braces as
> \sfrac needs. It is not a good habit to rely on undocumented features
> while \textbf1 and \frac1x are based on features documented in The
> TeXbook.
Perhaps it is time for the LaTeX-3 team to produce a van Wijngaarden 
grammar 2-level grammar for LaTeX.
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