Changing value of custom directive in template causes prod build failing.

[mohaxspb]

🐞 bug report

Affected Package

The issue is caused by package @angular/compiler

Is this a regression?

No

Description

If there is custom directive in template and you assign new value to it in template prod build fails.

🔬 Minimal Reproduction

Repository with example: https://github.com/mohaxspb/ng-var-directive-issue

To get error just run ng build --prod

🔥 Exception or Error

ERROR in Cannot assign to a reference or variable!

🌍 Your Environment

Angular Version:

Angular CLI: 8.3.4
Node: 10.15.3
OS: win32 x64
Angular: 9.0.0-next.6+80.sha-df1c456.with-local-changes
... animations, bazel, common, compiler, compiler-cli, core
... elements, forms, language-service, localize
... platform-browser, platform-browser-dynamic, platform-server
... platform-webworker, platform-webworker-dynamic, router
... service-worker, upgrade

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.803.4
@angular-devkit/build-angular     0.803.4
@angular-devkit/build-optimizer   0.803.4
@angular-devkit/build-webpack     0.803.4
@angular-devkit/core              8.3.4
@angular-devkit/schematics        8.3.4
@angular/cli                      8.3.4
@ngtools/webpack                  8.3.4
@schematics/angular               8.3.4
@schematics/update                0.803.4
rxjs                              6.4.0
typescript                        3.5.3
webpack                           4.39.2

Anything else relevant?

I'm in progress with PR with fix for it

[Splaktar]

In the future, it would be best if example directives did not use the ngXX for directives that are not created by Angular. I.e. for your directives use something like *myVar instead of *ngVar.

[mohaxspb]

@Splaktar OK, I change it in example)

[alxhub]

Closing as a duplicate of #32695.

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