doc: Fix tutorial for struct deref
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@ -793,15 +793,6 @@ synonym for an existing type but is rather its own distinct type.
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struct GizmoId(int);
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~~~~
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For convenience, you can extract the contents of such a struct with the
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dereference (`*`) unary operator:
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~~~~
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# struct GizmoId(int);
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let my_gizmo_id: GizmoId = GizmoId(10);
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let id_int: int = *my_gizmo_id;
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~~~~
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Types like this can be useful to differentiate between data that have
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the same underlying type but must be used in different ways.
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@ -811,7 +802,16 @@ struct Centimeters(int);
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~~~~
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The above definitions allow for a simple way for programs to avoid
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confusing numbers that correspond to different units.
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confusing numbers that correspond to different units. Their integer
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values can be extracted with pattern matching:
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~~~
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# struct Inches(int);
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let length_with_unit = Inches(10);
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let Inches(integer_length) = length_with_unit;
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println!("length is {} inches", integer_length);
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~~~
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# Functions
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