Assignability

Go 语言规范 /

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A value x is assignable to a variable of type T ("x is assignable to T") if one of the following conditions applies:

x's type is identical to T.
x's type V and T have identical underlying types and at least one of V or T is not a defined type.
T is an interface type and x implements T.
x is a bidirectional channel value, T is a channel type, x's type V and T have identical element types, and at least one of V or T is not a defined type.
x is the predeclared identifier nil and T is a pointer, function, slice, map, channel, or interface type.
x is an untyped constant representable by a value of type T.

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