Re: bash: bug report Here document and Command substitution

[Chet Ramey]

> The following syntax do not work (parse error).
> 
> echo $(cat <<-EOF
>         this is a )
>         EOF
> )

It's lazy evaluation.  Bash doesn't parse the contents of a command
substitution until it's time for the command to be executed.  Since
the closing right paren is seen first, before the here document
parse is attempted, a syntax error will occur later.

Parsing commands inside $(...) at the same time the command containing
the $(...) is being parsed is very hard to do with a yacc-based parser.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet)

Chet Ramey, CWRU    chet@po.CWRU.Edu    http://cnswww.cns.cwru.edu/~chet/