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Lazily evaluate static conditions for static if, static assert and template constraints.

Source staticcond.d

const(char)* visualizeStaticCondition(Expression original, Expression instantiated, const Expression[] negatives, bool full, ref uint itemCount);
Format a static condition as a tree-like structure, marking failed and bypassed expressions.
Expression original original expression
Expression instantiated instantiated expression
Expression[] negatives array with negative clauses from instantiated expression
bool full controls whether it shows the full output or only failed parts
uint itemCount returns the number of written clauses
formatted string or null if the expressions were null, or if the instantiated expression is not based on the original one