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go/types: type mismatch error less helpful since go 1.18 #57160

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gnojus opened this issue Dec 8, 2022 · 2 comments
Closed

go/types: type mismatch error less helpful since go 1.18 #57160

gnojus opened this issue Dec 8, 2022 · 2 comments
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@griesemer
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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Go1.20

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@gnojus
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gnojus commented Dec 8, 2022

What version of Go are you using (go version)?

$ go version
go version go1.19.4 linux/amd64

Does this issue reproduce with the latest release?

Yes

What did you do?

https://go.dev/play/p/rctUQ2F2oSI

package main

func main() {
	_ = 0 < new(int)
}

go 1.17:

./main.go:4:8: invalid operation: 0 < new(int) (mismatched types int and *int)

go 1.18/19/tip:

./main.go:4:6: cannot convert 0 (untyped int constant) to *int

Also, even if the constant could be converted to *int, the < operator is not defined on it.
@seankhliao seankhliao added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Dec 8, 2022
@seankhliao
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cc @griesemer @findleyr

@griesemer griesemer self-assigned this Dec 9, 2022
@griesemer griesemer added this to the Go1.21 milestone Dec 9, 2022
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Change https://go.dev/cl/457055 mentions this issue: go/types, types2: report type mismatch error when conversion is impossible

@griesemer griesemer modified the milestones: Go1.21, Go1.20 Dec 12, 2022
@griesemer griesemer added NeedsFix The path to resolution is known, but the work has not been done. and removed NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels Dec 12, 2022
@golang golang locked and limited conversation to collaborators Dec 13, 2023
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@griesemer griesemer

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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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Go1.20
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@griesemer @gopherbot @seankhliao @gnojus