way to warn about __traits(compiles , ...) that fail due to compile time interpretation lacking body ?

[Nicholas Wilson via Digitalmars-d-learn]

So I was recently trying to optimise a string substitution 
function by reserving capacity. however this was being used at 
compile time (mixin) and the body of arr.reserve(n) was not 
available causing a bug that was easy to observe but very 
difficult to determine why. As a result code was taking a wrong 
static if branch. I know __traits(compiles, ... ) is a blunt tool 
but it feels very wrong to have a function that works and 
complies at runtime, fail to compile at compile time and not 
receive any warning.