explain ty == None
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@ -57,6 +57,8 @@ struct IsStaticOrFn;
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/// `mode` is the mode of the environment where we found this pointer.
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/// `mutablity` is the mutability of the place to be interned; even if that says
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/// `immutable` things might become mutable if `ty` is not frozen.
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/// `ty` can be `None` if there is no potential interior mutability
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/// to account for (e.g. for vtables).
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fn intern_shallow<'rt, 'mir, 'tcx>(
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ecx: &'rt mut CompileTimeEvalContext<'mir, 'tcx>,
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leftover_allocations: &'rt mut FxHashSet<AllocId>,
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@ -97,6 +99,7 @@ fn intern_shallow<'rt, 'mir, 'tcx>(
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// read-only memory, and also by Miri when evluating other constants/statics that
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// access this one.
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if mode == InternMode::Static {
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// When `ty` is `None`, we assume no interior mutability.
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let frozen = ty.map_or(true, |ty| ty.is_freeze(
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ecx.tcx.tcx,
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ecx.param_env,
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