Why do some std :: fmt :: Debug * methods use dynamic dispatch?

Question

These methods use dynamic scheduling (receive the attribute object &Debugas a parameter):

• DebugMap::entry
• DebugSet::entry
• DebugStruct::field
• DebugTuple::field
• DebugList::entry

These methods use static dispatch and are written in terms of the associated method entry:

• DebugMap::entries
• DebugSet::entries
• DebugList::entries

Why does the first list of methods use dynamic dispatch instead of static dispatch? If static sending has been used, will their use be limited?

Answer 1

Static dispatching uses monomorphization, which creates a separate copy of the code for each particular type.

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, ( &Trait).

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- Debug impls, Debug , .