Can Go Variadic Functions Mix Enumerated Arguments and Slices?

Incompatibilities in Variadic Function Arguments

In Go, variadic function arguments provide a convenient way to specify parameters that accept a variable number of arguments. However, there are certain restrictions when mixing "exploded" slices with regular parameters in variadic functions.

The underlying limitation is that variadic arguments must be either explicitly enumerated or passed as a slice, but not both. When a slice is used (...stuff), it is passed directly as the value of the variadic parameter without creating a new slice. In contrast, enumerating the elements (e.g., "bar", stuff...) results in the creation of a new slice with the provided arguments.

The compiler prohibits mixing these two forms because it would require the allocation of a new slice, which is not supported by the Go language specification. The error "too many arguments in call to foo" indicates that the function signature expects a single variadic parameter, which cannot be satisfied by both enumerated elements and a slice.

This limitation ensures that the variadic parameter receives either a slice directly or a newly created slice with the enumerated elements. It prevents potential confusion and inconsistencies in the handling of variadic arguments.

In languages like Ruby, the *foo syntax allows the expansion of an existing array into a variadic parameter. However, in Go, this is not possible due to the strict separation between enumerated elements and slices in variadic arguments.

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