dest_exists1 : term -> term * term
SYNOPSIS
Breaks apart a unique existence term into quantified variable and body.
DESCRIBE
If
M
has the form
?!x. t
, then
dest_exists1 M
returns
(x,t)
.
FAILURE
Fails if
M
is not a unique existence term.
SEEALSO
mk_exists1
,
is_exists1
HOL
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