pub enum Purpose {
BoundImpl,
Declare,
}
Expand description
The goal of tracing generic parameter usage.
Not all uses of type parameters imply a need to add bounds to a generated trait impl.
For example, a field of type <Vec<T> as a::b::Trait>::Associated
does not need a
where T: Serialize
bound in serde
.
However, a proc macro that is attempting to generate a helper struct would need to
know about this usage, or else the generated code would reference an unknown type T
and fail to compile.
The tracing is being used to generate an impl
block.
Uses such as syn::TypePath.qself
will not be returned.
The tracing is being used to generate a new struct or enum.
All uses will be returned.
Performs copy-assignment from
source
.
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Formats the value using the given formatter.
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Converts to this type from the input type.
This method tests for self
and other
values to be equal, and is used
by ==
.
This method tests for !=
. The default implementation is almost always
sufficient, and should not be overridden without very good reason.
Immutably borrows from an owned value.
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Mutably borrows from an owned value.
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Returns the argument unchanged.
Calls U::from(self)
.
That is, this conversion is whatever the implementation of
From<T> for U
chooses to do.
The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning.
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Uses borrowed data to replace owned data, usually by cloning.
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The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.