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fmt: Println(1 << 31) panics on playground #10437

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gaal opened this issue Apr 13, 2015 · 1 comment
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fmt: Println(1 << 31) panics on playground #10437

gaal opened this issue Apr 13, 2015 · 1 comment
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@gaal
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gaal commented Apr 13, 2015

http://play.golang.org/p/XRZe_kcHav
http://play.golang.org/p/s9SX9Wd-PY

"constant 2147483648 overflows int"

Why doesn't the compiler pick a wider type, then?
@mdempsky
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This is working as intended. The Go spec says that the default type for integer constant expressions is "int", which on the Go playground is a 32-bit type and is unable to exactly represent the constant 1<<31. The compiler isn't picking a wider type because the spec doesn't allow it to.

@mikioh mikioh changed the title fmt.Println(1 << 31) panics on playground fmt: Println(1 << 31) panics on playground Apr 14, 2015
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@mdempsky @gaal @gopherbot