[tex-k] Possible error in The TeXbook Chapter 24

[Kim Young Min]

Hi,

The TeXbook p. 270 states the formal syntax of <unit of measure> as:

> <unit of measure>\is<optional spaces><internal unit>
>   \alt<optional {\tt true}><physical unit>

where

> <optional {\tt true}>\is[true]\alt<empty>

However, trying it out shows <optional spaces> is allowed around <optional
true>, i.e., `\kern3.5\space\space true\space\space pt` works.

This is consistent with TeX: The Program section 453, which uses
scan_keyword for scanning true.

So the formal syntax for <optional true> should be:

> <optional {\tt true}>\is<optional spaces>
>   \alt<optional {\tt true}>[true]<optional spaces>

Best regards,
Kim Young Min

——
Kim Young Min
BSc student

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