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(minor) Doc change for #3130
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@@ -716,7 +716,8 @@ untraced references are *unsafe*. However for certain low-level operations
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(accessing the hardware) untraced references are unavoidable.
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Traced references are declared with the **ref** keyword, untraced references
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are declared with the **ptr** keyword.
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are declared with the **ptr** keyword. In general, a `ptr T` is implicitly
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convertible to the `pointer` type.
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An empty subscript ``[]`` notation can be used to derefer a reference,
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the ``addr`` procedure returns the address of an item. An address is always
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