Standard complex number in std library

[bettertree]

Linking to your ACP, transitioned into an RFC:

Complex Numbers (Pre-ACP)

Continuing the discussion from Standard complex number in std library Proposal Problem statement Currently, there is no stable counterpart to the C _Complex types, and a myriad of implementations exist on crates.io. Popular crates like num-complex exist, but more often there are implementations defined by the crates themselves, which, while compatible with the other types in having the exact same implementation, require a myriad of conversion functions to convert with each other. Additionally,…