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gccgo: knowns unknown escape sequence #11575

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@dvyukov

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@dvyukov

gccgo successfully compiles the following program:

package a
var e = "\X00"

While gc and go/types say:

go.go:2: unknown escape sequence: X
go.go:2:11: unknown escape sequence

The spec allows only lower-case x for hex-encoded chars.

gcc version 6.0.0 2015070 (experimental) (GCC)

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