Description

A few months ago I hacked up support on top of Symfony EL for ES6-style template literals*.

While it works reasonably well (even though a hack, thanks to Symfony's ongoing extension hostility), I think it could make sense to have this built-in:

• template strings are extremely convenient in expressions: `${greeting} ${name}!` instead of greeting ~ ' ' ~ name ~ '!'
• Symfony's use of tilde as a concatenation operator is extremely unpopular
• since backticks are not currently a part of the EL syntax, implementing this feature will be backword compatible and relatively easy to implement

* the current implementation linked above does not change the Symfony EL parser/internals, but rather converts templating string syntax to Symfony syntax; using brackets and tildes.

Example

`Fifteen is ${a + b} and not ${2 * a + b}.`