update to crystal 0.29: undefined method new for T.class

Question

update to crystal 0.29: undefined method new for T.class

KCErb opened this issue 5 years ago · comments

I'm digging in now, not sure what happened to generics ... the zero method fails for matrices now: https://github.com/konovod/linalg/blob/master/src/matrix/matrix.cr#L22.

in lib/linalg/src/matrix/matrix.cr:22: undefined method 'new' for T.class

      T.new(0)
        ^~~

kipar · Answer 1 · Sat Jun 22 2019 12:22:25 GMT+0800 (China Standard Time)

Yeah, somehow T isn't expanded to its value in 0.29, i'll investigate it once i have a time.

kipar · Answer 2 · Sat Jun 22 2019 15:32:52 GMT+0800 (China Standard Time)

I think that is a compiler bug, so created crystal-lang/crystal#7914
Still no idea on how to workaround it as it breaks most of inherited methods.

KC Erb · Answer 3 · Sat Jun 22 2019 15:50:16 GMT+0800 (China Standard Time)

Nice! I was looking through the release notes for generic changes and didn't see any so I was really scratching my head as to which change broke it.

KC Erb · Answer 4 · Mon Jun 24 2019 17:46:55 GMT+0800 (China Standard Time)

It looks like this will land in v 0.30 thanks to crystal-lang/crystal#7916 so I'll wait to close this until then just in case someone comes along on v29 and experiences the same problem.