Remove T: Trace bound from GcCellRef<T>; add GcCellRef::clone #118
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This bound unnecessarily prohibited some valid uses of GcCellRef::map. Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
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The
T: Tracebound unnecessarily prohibited some valid uses ofGcCellRef::map(with#[unsafe_ignore_trace]).I wanted to remove
T: TracefromGcCellRefMut<T>too, but it currently usesT: Tracein a way that seems to be incorrect (#117).