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cmd/compile: spurious error for use of struct field with undefined type #54405

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rsc opened this issue Aug 12, 2022 · 2 comments
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cmd/compile: spurious error for use of struct field with undefined type #54405

rsc opened this issue Aug 12, 2022 · 2 comments
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compiler/runtime Issues related to the Go compiler and/or runtime. FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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@rsc
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rsc commented Aug 12, 2022

Go 1.19 (and tip):

package p

var x struct{ f *NotAType }
var _ = x.f == nil

var y *NotAType
var _ = y == nil
./prog.go:3:18: undefined: NotAType
./prog.go:4:16: invalid operation: x.f == nil (operator == not defined on untyped nil)
./prog.go:6:8: undefined: NotAType

The second error, on line 4, should not be printed.
Note that there is no second error involving y.
Something about the struct field is confusing the matter.

https://go.dev/play/p/UQP8ZveEPVh

@rsc rsc added NeedsFix The path to resolution is known, but the work has not been done. compiler/runtime Issues related to the Go compiler and/or runtime. labels Aug 12, 2022
@rsc rsc added this to the Go1.20 milestone Aug 12, 2022
@gopherbot
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Change https://go.dev/cl/423234 mentions this issue: cmd/compile: skip doing comparison for invalid types

@cuonglm cuonglm self-assigned this Aug 12, 2022
@gopherbot
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Change https://go.dev/cl/424054 mentions this issue: go/types, types2: skip comparison for operands with invalid types

@golang golang locked and limited conversation to collaborators Aug 16, 2023
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compiler/runtime Issues related to the Go compiler and/or runtime. FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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