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compiler: implement full slice expression

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This feature was introduced in Go 1.2 and is used by some standard
library packages.
This commit is contained in:
Ayke van Laethem
2019-08-02 12:19:23 +02:00
committed by Ron Evans
parent 54169c714f
commit 4688664b41
3 changed files with 75 additions and 16 deletions
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testdata/slice.go
Vendored
+14
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@@ -65,6 +65,20 @@ func main() {
assert(len(arr[uint64(1):uint64(3)]) == 2)
assert(len(arr[uintptr(1):uintptr(3)]) == 2)
// slicing with max parameter (added in Go 1.2)
longfoo := []int{1, 2, 4, 5, 10, 11}
assert(cap(longfoo[int(1):int(3):int(5)]) == 4)
assert(cap(longfoo[int8(1):int8(3):int8(5)]) == 4)
assert(cap(longfoo[int16(1):int16(3):int16(5)]) == 4)
assert(cap(longfoo[int32(1):int32(3):int32(5)]) == 4)
assert(cap(longfoo[int64(1):int64(3):int64(5)]) == 4)
assert(cap(longfoo[uint(1):uint(3):uint(5)]) == 4)
assert(cap(longfoo[uint8(1):uint8(3):uint8(5)]) == 4)
assert(cap(longfoo[uint16(1):uint16(3):uint16(5)]) == 4)
assert(cap(longfoo[uint32(1):uint32(3):uint32(5)]) == 4)
assert(cap(longfoo[uint64(1):uint64(3):uint64(5)]) == 4)
assert(cap(longfoo[uintptr(1):uintptr(3):uintptr(5)]) == 4)
// copy
println("copy foo -> bar:", copy(bar, foo))
printslice("bar", bar)