DRY version of `static if(__traits(compiles, expr)) fun(expr)`

[Timothee Cour via Digitalmars-d-learn]

what's the best (and DRY) way to achieve:

```
static if(__traits(compiles, expr))
  fun(expr);
```

ie, without repeating the expression inside expr?

eg:

```
static if(__traits(compiles, foo.bar[2])){
  counter++;
  writeln(" expr = ", foo.bar[2]);
}

```
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