Hi there,
I am writing a simple macro `if-let` that tried to bind the condition to a
variable.
```
(define-simple-macro (if-let (~describe "binding pairs" [binding:expr
value:expr])
(~describe "\"then\" clause" then:expr)
(~describe "\"else\" clause" else:expr))
(let ([val value])
(if val (match-let ([binding val]) then) else)))
```
I finished the macro and start to write unit tests for it. Then I realized that
the "binding" should not working in "else" statement. That means:
```
(if-let [it #f]
'true
it ; <- should report "unbound identifier".
)
```
However when I tried the following code:
```
(check-exn exn:fail?
(lambda ()
(if-let [it #f]
(fail "if-let: wrong-branch")
it)))
```
It gives error:
```
it: unbound identifier in module
```
So the question is how to catch the "unbound identifier" exception for unit
test?
Thanks!
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