Provide an option to require explicit `var` declarations

[christoph_schlumpf]

I think the main "friction“ here is the mixture of “explicit block-scoped” and “implicit function-scoped” declarations in Mojo functions. This adds some complexity to the language. Having just one declaration style would make Mojo less complex and easier to read and understand.

[christoph_schlumpf]

FYI :

Requiring `var` for variable declarations

We’re making a fairly major change in Mojo syntax leading up to 1.0: var will now be required before new variable declarations. Previously, you could declare a new variable either through the use of an explicit var variable = ... or through variable = .... We will start warning about the use of the latter in the next nightly, and then make it an error to use that syntax before 1.0. The two ways of declaring a new variable in Mojo have been the subject of lengthy prior discussions and we know th…

[jbemmel (Jeroen van Bemmel)]

May I suggest to update the Mojo skills to proactively include this change, if not already done?

[BradLarson]

Great suggestion, we’ll try to call this out in there.

[dunnoconnor (Michael Dunn-OConnor)]

Just pushed an update to the skills that will go out with the next release