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spec: fix EBNF for slice syntax
The () parentheses grouped wrongly. Removed them completely in favor of separate 2- and 3-index slice alternatives which is clearer. Fixes #14477. Change-Id: I0b7521ac912130d9ea8740b8793b3b88e2609418 Reviewed-on: https://go-review.googlesource.com/19853 Reviewed-by: Ian Lance Taylor <iant@golang.org>
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@ -1,6 +1,6 @@
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<!--{
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"Title": "The Go Programming Language Specification",
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"Subtitle": "Version of January 5, 2016",
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"Subtitle": "Version of February 23, 2016",
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"Path": "/ref/spec"
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}-->
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@ -2443,9 +2443,8 @@ PrimaryExpr =
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Selector = "." identifier .
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Index = "[" Expression "]" .
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Slice = "[" ( [ Expression ] ":" [ Expression ] ) |
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( [ Expression ] ":" Expression ":" Expression )
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"]" .
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Slice = "[" [ Expression ] ":" [ Expression ] "]" |
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"[" [ Expression ] ":" Expression ":" Expression "]" .
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TypeAssertion = "." "(" Type ")" .
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Arguments = "(" [ ( ExpressionList | Type [ "," ExpressionList ] ) [ "..." ] [ "," ] ] ")" .
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</pre>
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