Supply result type to operand of `try` about zig HOT 3 OPEN

A slightly less esoteric use-case today is try @errorCast(xyz) in a function with a concrete error set.

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@InKryption the usecase I was initially considering when suggesting this was #9938. With decl literals and this both implemented, you'd be able to do stuff like const foo: ArrayList = try .initCapacity(allocator, 10); without needing to special-case try in the decl literal logic.

Other usecases are a bit more niche, but one example is const foo: u32 = try if (cond) 3 else error.Foo;
That example is a bit contrived though haha

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Speaking as a bit of a layman to the compiler jargon, might I ask what type of code this would allow which currently is not allowed?

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