cmd/go2go: embedded generic type panic: receiver type parameter inference failed #39758
Comments
ianlancetaylor
added
the
NeedsInvestigation
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Thanks for the test case. This is a known internal bug at the moment. Probably won't get to this for a while (1-2 weeks) due to upcoming vacation. |
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The below is a probably related but more confusing failure mode. https://go2goplay.golang.org/p/6S_TbYbI-Jo package main
type top(type T, T2) struct {
p *parent(T, T2)
}
type parent(type T, T2) struct {
(child(T, T2))
}
type child(type T, T2) struct {
T2
}
func (d *top(T, T2)) foo() *T {
// panic: internal error: receiver type parameter inference failed
// t, _ := d.p.foo()
// panic: -: unexpected type string character '₇' in "T₇"
t, _ := d.p.child.foo()
return t
}
func (rb *child(T, T2)) foo() (*T, bool) {
return nil, true
}
func main() {
var _ top(int, int)
}It panics with: |
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Here is another program that exhibits a similar issue: |
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@sebastien-rosset Thanks. That example works on the tip of the dev.go2go branch. The playground hasn't caught up yet. |
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Probably not super useful, but here is a shorter example (from #39634) that seems to trigger a similar crash as the report above from @rogpeppe : https://go2goplay.golang.org/p/mXpWPHuuiw0 In the current playground, that example and the example from @rogpeppe both panic in |
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This case is unrelated. |
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This code, updated to the current syntax (and with unexported identifiers since the compiler cannot handle generic exported types quite yet) type-checks and compiles (e.g., The remaining error ( Closing as a (likely) duplicate of #44345. |
commit 0a03088
The following program panics with "receiver type parameter inference failed".
It looks like it should be OK to me.
https://go2goplay.golang.org/p/LlR3obmF3w8
The full stack trace is:
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