compiler bug?

[Dan Kortschak]

I have just noticed a weird set of go1.5.1 errors from code that compiles with 1.4:

$ go get github.com/biogo/examples/krishna
# github.com/biogo/examples/krishna
../../../examples/krishna/krishna.go:21: invalid operation: 1 << (uint(pals.filterParams·3.WordSize) * 2) (shift of type float64)
../../../examples/krishna/krishna.go:222: tempname called with nil type
../../../examples/krishna/krishna.go:222: cannot use autotmp_0166 (type int32) as type float64 in assignment


The actual code in the first (21) error is (in
github.com/biogo/align/pals/pals.go +211):

func (p *PALS) AvgIndexListLength(filterParams *filter.Params) float64 {
return float64(p.target.Len()) / float64(int(1)<<(uint(filterParams.WordSize)*2))
}

It looks like the int is being ignored in the shift in this case

It's not clear where the error at 222 is coming from since there is no
context.


It would also be nice if the errors were a little more informative -
krishna.go +21 is an import statement and krishna.go +222 is a call to
the pals method above.



thanks
Dan

[Brad Fitzpatrick]

I see you filed a bug (https://github.com/golang/go/issues/12677). We can move discussion there.

Dan

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