Implement When Expressions #3117

jerop · 2020-08-19T17:55:10Z

Adding WhenExpressions used to efficiently specify guarded execution
of Tasks, without spinning up new pods. We use WhenExpressions to
avoid adding an opinionated and complex expression language to the Tekton
API to ensure Tekton can be supported by as many systems as possible.
Further details about the design are in Conditions Beta TEP.

The components of WhenExpressions are Input, Operator
and Values:

Input is the input for the Guard checking which can be static
inputs or variables, such as Parameters or Results.
Operator represents an Input's relationship to a set of Values.
Operators we will use in WhenExpressions are In and NotIn.
Values is an array of string values. The Values array must be
non-empty. It can contain static values or variables (Parameters or
Results).

The declared WhenExpressions are evaluated before the Task is run.
If all the WhenExpressions evaluate to True, the Task is run.
If any of the WhenExpressions evaluate to False, the Task is
skipped.

Some key parts of this PR are:

Expressions package, which can be reused beyond WhenExpressions
WhenExpressions type in the PipelineTask
Variable substitution for Results and Parameters used in
WhenExpressions, either in Input or in Values -- can be extended to
use other variables.
Resource dependency mapping when resources (e.g. Results) are
used from other Tasks
Validation of WhenExpressions, variable substitution, among others
Evaluation of WhenExpressions and updates to Task execution
based on the evaluation results
WhenExpressionsStatus that exposes the evaluation inputs and results
A practical example of using WhenExpression, tests and documentation

Changes

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

Includes tests (if functionality changed/added)
Includes docs (if user facing)
Commit messages follow commit message best practices
Release notes block has been filled in or deleted (only if no user facing changes)

See the contribution guide for more details.

Double check this list of stuff that's easy to miss:

If you are adding a new binary/image to the cmd dir, please update
the release Task to build and release this image.

Reviewer Notes

If API changes are included, additive changes must be approved by at least two OWNERS and backwards incompatible changes must be approved by more than 50% of the OWNERS, and they must first be added in a backwards compatible way.

Release Notes

- To run a `Task` only when certain criteria are met, it is now possible to _guard_ task execution using
the `when` field, which allows you to list a series of references to `WhenExpressions` that contain
an `Input`, an `Operator` and `Values`. The `WhenExpressions` are ANDed.
- Conditions are deprecated, use WhenExpressions instead.

tekton-robot · 2020-08-19T17:55:20Z

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
To complete the pull request process, please assign dlorenc
You can assign the PR to them by writing /assign @dlorenc in a comment when ready.

The full list of commands accepted by this bot can be found here.

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jerop · 2020-08-19T17:56:36Z

/kind feature
/cc @bobcatfish @jlpettersson

tekton-robot · 2020-08-19T17:58:40Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.2%	81.4%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	62.1%	47.5%	-14.6
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	95.7%	-0.4
pkg/expression/expression.go	Do not exist	55.6%
pkg/reconciler/pipelinerun/pipelinerun.go	85.6%	84.5%	-1.1
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	84.8%	-5.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	87.8%	89.3%	1.5

tekton-robot · 2020-08-19T18:17:38Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.2%	81.4%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	62.1%	47.5%	-14.6
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	95.7%	-0.4
pkg/expression/expression.go	Do not exist	55.6%
pkg/reconciler/pipelinerun/pipelinerun.go	85.6%	84.5%	-1.1
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	84.8%	-5.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	87.8%	87.8%	-0.0

docs/pipelines.md

examples/v1beta1/pipelineruns/pipelinerun-with-when-expressions.yaml

pritidesai · 2020-08-19T20:54:26Z

This is Very exciting 🎉 I have reviewed doc and an example so far.

tekton-robot · 2020-08-19T21:05:50Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.2%	81.4%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	62.1%	47.5%	-14.6
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	95.7%	-0.4
pkg/expression/expression.go	Do not exist	77.8%
pkg/reconciler/pipelinerun/pipelinerun.go	85.6%	84.5%	-1.1
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	84.8%	-5.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	87.8%	87.8%	-0.0

tekton-robot · 2020-08-19T21:21:26Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.2%	81.4%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	62.1%	47.5%	-14.6
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	95.7%	-0.4
pkg/expression/expression.go	Do not exist	77.8%
pkg/reconciler/pipelinerun/pipelinerun.go	85.6%	84.5%	-1.1
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	84.8%	-5.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	87.8%	88.5%	0.7

tekton-robot · 2020-08-20T02:07:58Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.2%	81.4%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	62.1%	47.5%	-14.6
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	95.7%	-0.4
pkg/expression/expression.go	Do not exist	77.8%
pkg/reconciler/pipelinerun/pipelinerun.go	85.6%	84.5%	-1.1
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	90.8%	0.6
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	87.8%	87.8%	-0.0

tekton-robot · 2020-08-20T02:41:34Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.2%	81.4%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	62.1%	47.5%	-14.6
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	95.7%	-0.4
pkg/expression/expression.go	Do not exist	77.8%
pkg/reconciler/pipelinerun/pipelinerun.go	85.6%	85.8%	0.2
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	90.8%	0.6
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	87.8%	89.3%	1.5

tekton-robot · 2020-08-20T03:51:05Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.2%	81.4%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	62.1%	57.5%	-4.6
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	96.1%	0.0
pkg/expression/expression.go	Do not exist	77.8%
pkg/reconciler/pipelinerun/pipelinerun.go	85.6%	85.8%	0.2
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	90.8%	0.6
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	87.8%	87.8%	-0.0

tekton-robot · 2020-08-24T17:05:50Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.8%	82.0%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	60.0%	63.9%	3.9
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	94.3%	-1.8
pkg/apis/pipeline/v1beta1/when_types.go	Do not exist	61.3%
pkg/apis/pipeline/v1beta1/when_validation.go	Do not exist	92.9%
pkg/reconciler/pipelinerun/pipelinerun.go	86.3%	85.4%	-0.9
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	90.6%	0.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	88.7%	93.1%	4.4
pkg/when/when.go	Do not exist	100.0%

tekton-robot · 2020-08-24T17:13:30Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.8%	82.0%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	60.0%	63.9%	3.9
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	94.3%	-1.8
pkg/apis/pipeline/v1beta1/when_types.go	Do not exist	61.3%
pkg/apis/pipeline/v1beta1/when_validation.go	Do not exist	92.9%
pkg/reconciler/pipelinerun/pipelinerun.go	86.3%	85.4%	-0.9
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	90.6%	0.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	88.7%	91.6%	2.9
pkg/when/when.go	Do not exist	100.0%

tekton-robot · 2020-08-24T17:50:23Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.8%	82.0%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	60.0%	63.9%	3.9
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	94.3%	-1.8
pkg/apis/pipeline/v1beta1/when_types.go	Do not exist	61.3%
pkg/apis/pipeline/v1beta1/when_validation.go	Do not exist	92.9%
pkg/reconciler/pipelinerun/pipelinerun.go	86.3%	86.1%	-0.2
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	90.6%	0.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	88.7%	91.6%	2.9
pkg/when/when.go	Do not exist	100.0%

tekton-robot · 2020-08-24T18:27:00Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.8%	82.0%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	60.0%	63.9%	3.9
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	94.3%	-1.8
pkg/apis/pipeline/v1beta1/when_types.go	Do not exist	61.3%
pkg/apis/pipeline/v1beta1/when_validation.go	Do not exist	92.9%
pkg/reconciler/pipelinerun/pipelinerun.go	86.3%	86.6%	0.3
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	90.6%	0.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	88.7%	91.6%	2.9
pkg/when/when.go	Do not exist	100.0%

tekton-robot · 2020-08-24T18:42:03Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.8%	82.0%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	60.0%	63.9%	3.9
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	96.1%	0.0
pkg/apis/pipeline/v1beta1/when_types.go	Do not exist	45.5%
pkg/apis/pipeline/v1beta1/when_validation.go	Do not exist	96.7%
pkg/reconciler/pipelinerun/pipelinerun.go	86.3%	86.6%	0.3
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	90.6%	0.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	88.7%	91.6%	2.9
pkg/when/when.go	Do not exist	100.0%

tekton-robot · 2020-08-24T19:49:19Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.8%	82.0%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	60.0%	63.9%	3.9
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	96.1%	0.0
pkg/apis/pipeline/v1beta1/when_types.go	Do not exist	86.4%
pkg/apis/pipeline/v1beta1/when_validation.go	Do not exist	100.0%
pkg/reconciler/pipelinerun/pipelinerun.go	86.3%	86.6%	0.3
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	90.6%	0.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	88.7%	93.1%	4.4
pkg/when/when.go	Do not exist	100.0%

tekton-robot · 2020-08-24T20:27:23Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.8%	82.0%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	60.0%	63.9%	3.9
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	96.1%	0.0
pkg/apis/pipeline/v1beta1/when_types.go	Do not exist	86.4%
pkg/apis/pipeline/v1beta1/when_validation.go	Do not exist	100.0%
pkg/reconciler/pipelinerun/pipelinerun.go	86.3%	86.6%	0.3
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	90.6%	0.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	88.7%	91.6%	2.9
pkg/when/when.go	Do not exist	100.0%

tekton-robot · 2020-08-24T21:58:38Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.8%	82.0%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	60.0%	63.9%	3.9
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	96.1%	0.0
pkg/apis/pipeline/v1beta1/when_types.go	Do not exist	100.0%
pkg/apis/pipeline/v1beta1/when_validation.go	Do not exist	100.0%
pkg/reconciler/pipelinerun/pipelinerun.go	86.3%	86.6%	0.3
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	90.6%	0.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	88.7%	91.6%	2.9
pkg/when/when.go	Do not exist	100.0%

tekton-robot · 2020-08-25T12:57:56Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.8%	82.0%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	60.0%	63.9%	3.9
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	96.1%	0.0
pkg/apis/pipeline/v1beta1/when_types.go	Do not exist	100.0%
pkg/apis/pipeline/v1beta1/when_validation.go	Do not exist	100.0%
pkg/reconciler/pipelinerun/pipelinerun.go	86.3%	86.6%	0.3
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	90.6%	0.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	88.7%	91.6%	2.9
pkg/when/when.go	Do not exist	100.0%

tekton-robot · 2020-08-25T13:04:33Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.8%	82.0%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	60.0%	63.9%	3.9
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	96.1%	0.0
pkg/apis/pipeline/v1beta1/when_types.go	Do not exist	100.0%
pkg/apis/pipeline/v1beta1/when_validation.go	Do not exist	100.0%
pkg/reconciler/pipelinerun/pipelinerun.go	86.3%	86.6%	0.3
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	90.6%	0.4
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	88.7%	93.1%	4.4
pkg/when/when.go	Do not exist	100.0%

tekton-robot · 2020-08-25T20:30:51Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.8%	82.0%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	60.0%	63.9%	3.9
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	96.1%	0.0
pkg/apis/pipeline/v1beta1/when_types.go	Do not exist	69.2%
pkg/apis/pipeline/v1beta1/when_validation.go	Do not exist	100.0%
pkg/reconciler/pipelinerun/pipelinerun.go	86.3%	85.9%	-0.5
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	88.3%	-1.8
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	87.8%	91.6%	3.8

@vdemeester

Discussed with other pipelines owners today (@vdemeester, @sbwsg, @dibyom @imjasonh and we think it makes sense to include this in the roadmap tho we'd want to flesh out the details and might not want it exactly as described in the original issue. Also added area/roadmap labels to the items listed here!

tekton-robot · 2020-08-25T20:36:44Z

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
internal/builder/v1beta1/pipeline.go	81.8%	82.0%	0.2
pkg/apis/pipeline/v1beta1/pipeline_types.go	60.0%	63.9%	3.9
pkg/apis/pipeline/v1beta1/pipeline_validation.go	96.1%	96.1%	0.0
pkg/apis/pipeline/v1beta1/when_types.go	Do not exist	69.2%
pkg/apis/pipeline/v1beta1/when_validation.go	Do not exist	100.0%
pkg/reconciler/pipelinerun/pipelinerun.go	86.3%	85.9%	-0.5
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	90.2%	88.3%	-1.8
pkg/reconciler/pipelinerun/resources/resultrefresolution.go	87.8%	91.6%	3.8

tekton-robot · 2020-08-25T21:00:10Z

@jerop: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-tekton-pipeline-build-tests	`cfc1ff6`	link	`/test pull-tekton-pipeline-build-tests`
pull-tekton-pipeline-integration-tests	`cfc1ff6`	link	`/test pull-tekton-pipeline-integration-tests`

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

tekton-robot · 2020-08-25T21:00:10Z

@jerop: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-tekton-pipeline-build-tests	`cfc1ff6`	link	`/test pull-tekton-pipeline-build-tests`
pull-tekton-pipeline-integration-tests	`cfc1ff6`	link	`/test pull-tekton-pipeline-integration-tests`

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

pritidesai · 2020-08-25T22:13:20Z

Hey @jerop what happened? creating a new/separate PR?

jerop · 2020-08-25T23:20:39Z

@pritidesai yes, here it is: #3135

tekton-robot added the release-note Denotes a PR that will be considered when it comes time to generate release notes. label Aug 19, 2020

tekton-robot requested review from afrittoli and pritidesai August 19, 2020 17:55

tekton-robot added the size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. label Aug 19, 2020

jerop marked this pull request as draft August 19, 2020 17:55

tekton-robot requested review from bobcatfish and jlpettersson August 19, 2020 17:56

tekton-robot added kind/feature Categorizes issue or PR as related to a new feature. do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. labels Aug 19, 2020

jerop force-pushed the when branch from e7a95aa to 73113db Compare August 19, 2020 18:14

jerop changed the title ~~Implement WhenExpressions~~ Implement When Expressions Aug 19, 2020

jerop force-pushed the when branch from 73113db to d005c9a Compare August 19, 2020 18:46

pritidesai reviewed Aug 19, 2020

View reviewed changes

docs/pipelines.md Outdated Show resolved Hide resolved

pritidesai reviewed Aug 19, 2020

View reviewed changes

examples/v1beta1/pipelineruns/pipelinerun-with-when-expressions.yaml Outdated Show resolved Hide resolved

pritidesai reviewed Aug 19, 2020

View reviewed changes

examples/v1beta1/pipelineruns/pipelinerun-with-when-expressions.yaml Outdated Show resolved Hide resolved

jerop force-pushed the when branch from d005c9a to 9507771 Compare August 19, 2020 21:01

jerop force-pushed the when branch from 9507771 to f8bf0b1 Compare August 19, 2020 21:18

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jerop closed this Aug 25, 2020

jerop deleted the when branch September 30, 2020 16:00

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Implement When Expressions #3117

Implement When Expressions #3117

jerop commented Aug 19, 2020 •

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Implement When Expressions #3117

Implement When Expressions #3117

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jerop commented Aug 19, 2020 • edited

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jerop commented Aug 19, 2020 •

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