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spec: clarify that shift count must be non-negative
Fixes #34056. Change-Id: I2c9b7a20d19f458df5dcc376e29bee6be1f09f7a Reviewed-on: https://go-review.googlesource.com/c/go/+/193277 Reviewed-by: Brad Fitzpatrick <bradfitz@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 Aug 26, 2019",
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"Subtitle": "Version of Sep 4, 2019",
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"Path": "/ref/spec"
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}-->
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@ -3732,7 +3732,7 @@ be replaced by a bitwise AND operation:
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<p>
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The shift operators shift the left operand by the shift count specified by the
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right operand, which must be positive. If the shift count is negative at run time,
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right operand, which must be non-negative. If the shift count is negative at run time,
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a <a href="#Run_time_panics">run-time panic</a> occurs.
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The shift operators implement arithmetic shifts if the left operand is a signed
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integer and logical shifts if it is an unsigned integer.
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