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Add more context to the forbidden dep-graph read ICE error message.
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@ -1402,6 +1402,10 @@ fn panic_on_forbidden_read<D: Deps>(data: &DepGraphData<D>, dep_node_index: DepN
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panic!(
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"Error: trying to record dependency on DepNode {dep_node} in a \
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context that does not allow it (e.g. during query deserialization)."
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context that does not allow it (e.g. during query deserialization). \
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The most common case of recording a dependency on a DepNode `foo` is \
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when the correspondng query `foo` is invoked. Invoking queries is not \
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allowed as part of loading something from the incremental on-disk cache. \
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See <https://github.com/rust-lang/rust/pull/91919>."
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)
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}
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