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language re: conversion of left operand in shift operations

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Robert Griesemer 2009-07-31 18:05:07 -07:00
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doc/go_spec.html
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@ -9,6 +9,8 @@ Open issues:
Todo's:
[ ] need explicit language about the result type of operations
[ ] may want to have some examples for the types of shift operations
[ ] document illegality of package-external tuple assignments to structs
w/ private fields: P.T(1, 2) illegal since same as P.T(a: 1, b: 2) for
a T struct { a b int }.
@ -2440,6 +2442,9 @@ The operand types in binary operations must be compatible, with the following ex
ideal float, the other is converted to ideal float
(relevant for <code>/</code> and <code>%</code>).</li>
<li>In shift operations, the above rules apply to the left operand of the shift as
if the shift operator and the right operand where not present.
<li>The right operand in a shift operation must be always be of unsigned integer type
or an ideal number that can be safely converted into an unsigned integer type
(§Arithmetic operators).</li>