Re: [Help-bash] Why `$(<` is slow?

[Stephane Chazelas]

2019-08-30 09:51:08 -0400, Chet Ramey:
[...]
> Bash parses the command and makes sure it's a valid redirection instead
> of doing it lexically. That happens in the subshell just like any other
> command substitution.
[...]

By the way Chet, at that 
https://unix.stackexchange.com/questions/189749/understanding-bashs-read-a-file-command-substitution/368663#368663
I mention something that might be seen as a bug in bash:

bash-5.0$ echo test > file
bash-5.0$ echo "$(<file # comment
)"
test
bash-5.0$ echo $(# comment
< file)
test
bash-5.0$ echo $(< file
)
test


OK, but:

bash-5.0$ echo "$(<file
# comment
)"

bash-5.0$ echo $(< file

)


The $(<file) seems not to be recognised as the $(<file) operator
in the last two cases which seems a bit inconsistent.

-- 
Stephane