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test: add a couple of cases to const1.go that crashed gccgo
R=golang-dev, r CC=golang-dev https://golang.org/cl/5713045
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@ -43,7 +43,9 @@ var (
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b3 = Uint8 - Uint8 // OK
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b3 = Uint8 - Uint8 // OK
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b4 = Uint8 - Uint8 - Uint8 // ERROR "overflow"
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b4 = Uint8 - Uint8 - Uint8 // ERROR "overflow"
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b5 = uint8(^0) // ERROR "overflow"
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b5 = uint8(^0) // ERROR "overflow"
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b5a = int64(^0) // OK
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b6 = ^uint8(0) // OK
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b6 = ^uint8(0) // OK
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b6a = ^int64(0) // OK
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b7 = uint8(Minus1) // ERROR "overflow"
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b7 = uint8(Minus1) // ERROR "overflow"
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b8 = uint8(int8(-1)) // ERROR "overflow"
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b8 = uint8(int8(-1)) // ERROR "overflow"
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b8a = uint8(-1) // ERROR "overflow"
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b8a = uint8(-1) // ERROR "overflow"
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