Which @angular/* package(s) are the source of the bug?

compiler

Is this a regression?

No

Description

When using quotes in nested template literal there are several bugs :

With {{ }} :

• If there is an odd number simple quote ' or double quote " it display source code (example: {{ `${`test with odd 'simple quote' ' `}` }})

With @let :

• If there is an odd number simple quote ' or double quote " it triggers a parsing error
• If there is a escaped back quote \` it triggers a parsing error

I haven't done any further testing. I imagine this causes other errors.

Please provide a link to a minimal reproduction of the bug

https://stackblitz.com/edit/stackblitz-starters-8tr8q3bf?description=An%20angular-cli%20project%20based%20on%20@angular/animations,%20@angular/common,%20@angular/compiler,%20@angular/core,%20@angular/forms,%20@angular/platform-browser,%20@angular/platform-browser-dynamic,%20@angular/router,%20core-js,%20rxjs,%20tslib%20and%20zone.js&file=src%2Fmain.ts,src%2Fapp.html&template=node&title=Angular%20Starter

Please provide the exception or error you saw

`NG5002: Unexpected character "EOF" [plugin angular-compiler]`

Please provide the environment you discovered this bug in (run ng version)

Angular CLI: 20.0.0
Node: 20.19.1
Package Manager: npm 10.8.2
OS: linux x64

Angular: 20.0.0
... animations, build, cli, common, compiler, compiler-cli, core
... forms, platform-browser, router

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.2000.0
@angular-devkit/core         20.0.0
@angular-devkit/schematics   20.0.0
@schematics/angular          20.0.0
rxjs                         7.8.2
typescript                   5.8.2
zone.js                      0.15.0

Anything else?

No response