Module clippy_utils::eager_or_lazy

Utilities for evaluating whether eagerly evaluated expressions can be made lazy and vice versa.

Things to consider:

• has the expression side-effects?
• is the expression computationally expensive?

See lints:

• unnecessary-lazy-evaluations
• or-fun-call
• option-if-let-else

Functions

identify_some_potentially_expensive_patterns

Identify some potentially computationally expensive patterns. This function is named so to stress that its implementation is non-exhaustive. It returns FNs and FPs.

identify_some_pure_patterns

Is the expr pure (is it free from side-effects)? This function is named so to stress that it isn’t exhaustive and returns FNs.

is_eagerness_candidate

is_lazyness_candidate