doc: Clarified 4.2 Pattern matching
Combined redundant paragraphs about the match expression and removed a redundant example.
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@ -468,19 +468,16 @@ Unlike in C, there is no "falling through" between arms: only one arm
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executes, and it doesn't have to explicitly `break` out of the
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construct when it is finished.
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A `match` arm consists of a *pattern*, then an arrow `=>`, followed by
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an *action* (expression). Literals are valid patterns and match only
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their own value. A single arm may match multiple different patterns by
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combining them with the pipe operator (`|`), so long as every pattern
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binds the same set of variables. Ranges of numeric literal patterns
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can be expressed with two dots, as in `M..N`. The underscore (`_`) is
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a wildcard pattern that matches any single value. (`..`) is a different
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wildcard that can match one or more fields in an `enum` variant.
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The patterns in a match arm are followed by a fat arrow, `=>`, then an
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expression to evaluate. Each case is separated by commas. It's often
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convenient to use a block expression for each case, in which case the
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commas are optional.
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A `match` arm consists of a *pattern*, then a fat arrow `=>`, followed
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by an *action* (expression). Each case is separated by commas. It is
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often convenient to use a block expression for each case, in which case
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the commas are optional as shown below. Literals are valid patterns and
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match only their own value. A single arm may match multiple different
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patterns by combining them with the pipe operator (`|`), so long as every
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pattern binds the same set of variables. Ranges of numeric literal
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patterns can be expressed with two dots, as in `M..N`. The underscore
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(`_`) is a wildcard pattern that matches any single value. (`..`) is a
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different wildcard that can match one or more fields in an `enum` variant.
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~~~
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# let my_number = 1;
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