go/types, types2: print variadic argument in dotdotdot form in error message
If a variadic call to a variadic function has not enough/too many
arguments, then print the variadic argument in dotdotdot form
instead of as a slice type in the error message.
Fixes #70150
Change-Id: I81a802619b3b66195b303e2df2bafeb1433ad310
Reviewed-on: https://go-review.googlesource.com/c/go/+/624335 Reviewed-by: Robert Griesemer <gri@google.com> Reviewed-by: Robert Findley <rfindley@google.com>
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