tutorial: Un-xfail some working examples
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@ -642,7 +642,6 @@ you use the matching to get at the contents of data types. Remember
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that `(float, float)` is a tuple of two floats:
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~~~~
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## xfail-test
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fn angle(vec: (float, float)) -> float {
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alt vec {
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(0f, y) if y < 0f { 1.5 * float::consts::pi }
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@ -896,7 +895,6 @@ should almost always specify the type of that argument as `fn()`, so
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that callers have the flexibility to pass whatever they want.
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~~~~
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## xfail-test
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fn call_twice(f: fn()) { f(); f(); }
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call_twice({|| "I am a stack closure"; });
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call_twice(fn@() { "I am a boxed closure"; });
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@ -1156,7 +1154,6 @@ get at their contents. All variant constructors can be used as
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patterns, as in this definition of `area`:
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~~~~
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## xfail-test
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# type point = {x: float, y: float};
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# enum shape { circle(point, float), rectangle(point, point) }
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fn area(sh: shape) -> float {
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