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Clarify section on tokens.
Fixes #457. R=r CC=golang-dev https://golang.org/cl/181083
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@ -151,12 +151,13 @@ Comments do not nest.
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<p>
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Tokens form the vocabulary of the Go language.
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There are four classes: identifiers, keywords, operators
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and delimiters, and literals. <i>White space</i>, formed from
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There are four classes: <i>identifiers</i>, <i>keywords</i>, <i>operators
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and delimiters</i>, and <i>literals</i>. <i>White space</i>, formed from
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spaces (U+0020), horizontal tabs (U+0009),
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carriage returns (U+000D), and newlines (U+000A),
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is ignored except as it separates tokens
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that would otherwise combine into a single token.
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that would otherwise combine into a single token. Also, a newline
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may trigger the insertion of a <a href="#Semicolons">semicolon</a>.
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While breaking the input into tokens,
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the next token is the longest sequence of characters that form a
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valid token.
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