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Perhaps i misunderstand you, but isn't simply calling a function the same as what you quoted? Eg, `_ := Foo()` is the same as `Foo()`. No assignment needed.

`_` mainly exists to allow ignoring single values, within multiple. Eg, dropping an error: `val, _ := MightError()`

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Foo() can have side-effects, taking a value from an array cannot, so Foo() is not necessarily dead code, whilst a[0] certainly is.

_ serves multiple purposes, not just for ignoring a return value. It's often used when you care about the side effect but not the return value, such as importation a driver for a database . You'll never use the library, so you import it as _ "db.driver.name/path/".

Can't taking a value from an array result in a panic? Quite the side effect.

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