mirror of
https://github.com/golang/go
synced 2024-10-01 13:18:33 -06:00
6b75c15eec
(Elminate premature abstraction.) The test probes used Pointer!=nil for the "is pointerlike" predicate. Now that Pointer is a struct, they check the type of the expression, which is more accurate. Two probes on non-pointerlike values have beem removed. R=crawshaw CC=golang-dev https://golang.org/cl/38420043
35 lines
863 B
Go
35 lines
863 B
Go
// +build ignore
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package main
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var unknown bool
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type S string
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func incr(x int) int { return x + 1 }
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func main() {
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var i interface{}
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i = 1
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if unknown {
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i = S("foo")
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}
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if unknown {
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i = (func(int, int))(nil) // NB type compares equal to that below.
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}
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// Look, the test harness can handle equal-but-not-String-equal
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// types because we parse types and using a typemap.
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if unknown {
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i = (func(x int, y int))(nil)
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}
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if unknown {
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i = incr
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}
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print(i) // @types int | S | func(int, int) | func(int) int
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// NB, an interface may never directly alias any global
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// labels, even though it may contain pointers that do.
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print(i) // @pointsto makeinterface:func(x int) int | makeinterface:func(x int, y int) | makeinterface:func(int, int) | makeinterface:int | makeinterface:main.S
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print(i.(func(int) int)) // @pointsto main.incr
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}
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