Re: [NTG-context] Math letters in commands

On 12 Sep 2016, at 21:45, Hans Hagen wrote:

On 9/12/2016 8:25 PM, Hans Åberg wrote:

...

But then there seems to be a bug in the LuaTex \letcharcode command: There must be a character between “$” and the first occurring \activecatcode letter. Possibly this also causes a bug in \startformula, as discussed before.

it's not a bug .. tex looks ahead for a second $ and in the process expands the next token which happens to be a letter at that point so it gets injected as letter (it's the way tex works)

I’m not sure what you mean here: I must write $ ‘𝐝𝐢𝐦’ 𝑉$, because $‘𝐝𝐢𝐦’ 𝑉$ will not see the \catcode`‘=\activecatcode. So LuaTeX must see an ordinary letter after $ before it can see an \activecatcode character. It does not happen with TeX using \catcode`\‘=\active \def‘#1’{\csname #1\endcsname}