Prevent evaluation : quote hold ’

### 2.12.3 Prevent evaluation : `quote hold ’`

A quoted subexpression (either with `’` or with the `quote` or `hold`) command will not be evaluated.
Remark `a:=quote(a)` (or `a:=hold(a)`) is equivalent to `purge(a)` (for the sake of Maple compatibility). It returns the value of this variable (or the hypothesis done on this variable).
Input :

`a:=2;quote(2+3*a)`

or

`a:=2;’2+3*a’`

Output :

`(2,2+3.a)`