TestGoSyntax broken at v0.1.0 in Go 1.11

[bcmills]

~/src/golang.org/x/build$ go list -m github.com/kr/pretty
github.com/kr/pretty v0.1.0

~/src/golang.org/x/build$ go version
go version devel +55931b5e16 Mon Sep 24 12:55:24 2018 -0400 linux/amd64

~/src/golang.org/x/build$ go test github.com/kr/pretty
--- FAIL: TestGoSyntax (0.00s)
    formatter_test.go:170: expected "float64(1)"
    formatter_test.go:171: got      "float64(1.0)"
    formatter_test.go:172: expraw
        float64(1)
    formatter_test.go:173: gotraw
        float64(1.0)
    formatter_test.go:170: expected "(1+0i)"
    formatter_test.go:171: got      "(1.0+0.0i)"
    formatter_test.go:172: expraw
        (1+0i)
    formatter_test.go:173: gotraw
        (1.0+0.0i)
FAIL
FAIL    github.com/kr/pretty    0.019s