Either._readLeft

private

_LeftBox!S _readLeft(S)(return  ref  S storage) if (is(S ==  Storage)  ||  is(S ==  const(Storage))
             ||  is(S ==  immutable(Storage))  ||  is(S ==  inout(Storage)))

static ref pure nothrow @nogc @trusted

Read the left alternative's storage without qualifier loss.

Reading an overlapped union member that could hold indirections is @system in D, so member access is centralized here behind the same tag-checking trust the accessors apply (they never call this for the inactive alternative).

Parameters

storage union storage to read, under any qualifier.

Returns

reference to the left alternative's wrapper, same qualifier.