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go/types, types2: error reported for valid shifts #52080

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griesemer opened this issue Mar 31, 2022 · 10 comments
Open

go/types, types2: error reported for valid shifts #52080

griesemer opened this issue Mar 31, 2022 · 10 comments
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NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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Go1.23

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@griesemer
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Extracted from test/shift1.go which is currently not passing (excluded) in 1.18:

package p

func _(x int, s uint) {
	x = (1. << s) << (1 << s)
	x = (1. << s) << (1. << s)
}

reports

x.go:4:6: invalid operation: shifted operand (1. << s) (untyped float value) must be integer
x.go:5:6: invalid operation: shifted operand (1. << s) (untyped float value) must be integer

These should probably be valid. Regression.

cc @findleyr
@griesemer griesemer added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Mar 31, 2022
@griesemer griesemer added this to the Go1.19 milestone Mar 31, 2022
@griesemer griesemer self-assigned this Mar 31, 2022
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Change https://go.dev/cl/398316 mentions this issue: types2: don't report an error for certain valid shifts

@griesemer
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Didn't get to this. Moving to 1.20.

@griesemer griesemer modified the milestones: Go1.19, Go1.20 Jun 23, 2022
@griesemer griesemer added the early-in-cycle A change that should be done early in the 3 month dev cycle. label Jun 23, 2022
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This issue is currently labeled as early-in-cycle for Go 1.20.
That time is now, so a friendly reminder to look at it again.

@gopherbot
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Change https://go.dev/cl/426661 mentions this issue: go/types: test shifts that are disabled in shared test file

gopherbot pushed a commit that referenced this issue Sep 2, 2022
@griesemer
go/types: test shifts that are disabled in shared test file
e2d2d3a 
CL 425735 consolidated the testdata/check/shifts.go files between
go/types and types2. Because some shifts don't work correctly with
types2, the corresponding tests were disabled in the shared file.
Make sure we keep testing those shifts for go/types by adding a
local test file.

For #52080.
For #54511.

Change-Id: I53507e535bf83b204eaf18fc6c2efefcebf5ebf7
Reviewed-on: https://go-review.googlesource.com/c/go/+/426661
Reviewed-by: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>
@griesemer griesemer modified the milestones: Go1.20, Go1.21 Nov 15, 2022
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This issue is currently labeled as early-in-cycle for Go 1.21.
That time is now, so a friendly reminder to look at it again.

@griesemer
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Pushing ahead again.

@griesemer griesemer modified the milestones: Go1.21, Go1.22 Jun 1, 2023
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This issue is currently labeled as early-in-cycle for Go 1.22.
That time is now, so a friendly reminder to look at it again.

@griesemer
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Moving once more.

@griesemer griesemer modified the milestones: Go1.22, Go1.23 Oct 31, 2023
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This issue is currently labeled as early-in-cycle for Go 1.23.
That time is now, so a friendly reminder to look at it again.

@griesemer
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This has been open for some time w/o causing major issues - though it should be fixed.
Removing "early in cycle" label for now.

@griesemer griesemer removed the early-in-cycle A change that should be done early in the 3 month dev cycle. label Feb 6, 2024
@novitoll novitoll mentioned this issue Apr 17, 2024
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@griesemer griesemer

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Go1.23
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