Commits on Apr 22, 2021

1. [BUGFIX beta] [DEPRECATION] Deprecate @foo={{helper}} …

   Per [RFC 496](https://github.com/emberjs/rfcs/blob/master/text/0496-handlebars-strict-mode.md#3-no-implicit-invocation-of-argument-less-helpers),
   this commit deprecates the implicit invocation of argument-less
   helpers and requires explicit parenthesis if:
   
   1. Non-strict mode, AND
   2. `helper` is a free variable (not `this.helper`, `@helper` or
      a local variable), AND
   3. No arguments are provided to the helper, AND
   4. It's in a component invocation's named argument position (not
      `<div id={{helper}}>` or `<Foo bar={{helper}}>`), AND
   5. Not parenthesized (not `@foo={{(helper)}}`), AND
   6. Not interpolated (not `@foo="{{helper}}"`).
   
   The cases in real apps where all of the above are true should be
   quite rare, as most helpers take at least one argument.
   
   This is probably not the most efficient/minimal changes to the
   compiler infrastructure, but I chose to optimize for making the
   change easier to remove/rollback (i.e. adding new nodes instead
   of changing existing ones) as we won't be needing this for very
   long.
   
   This also bumps `@glimmer/*` to latest which also brings in the
   bugfix commit glimmerjs/glimmer-vm#1293.

   

   chancancode committed Apr 22, 2021
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