Reduced from a larger program where the error was more confusing:
$ cat /tmp/x.go
package p
func f() (int, bool) { return 1, false }
func g() {
var s string
s, b := f()
_, _ = s,b
}
$ GOTOOLCHAIN=go1.16 go tool compile /tmp/x.go
/tmp/x.go:7:7: cannot assign int to s (type string) in multiple assignment
$ GOTOOLCHAIN=go1.17 go tool compile /tmp/x.go
/tmp/x.go:7:7: cannot assign int to s (type string) in multiple assignment
/tmp/x.go:7:7: cannot use int value as type string in assignment
$ GOTOOLCHAIN=go1.18 go tool compile /tmp/x.go
/tmp/x.go:7:10: cannot use f() (value of type int) as type string in assignment
$ GOTOOLCHAIN=go1.26.0 go tool compile /tmp/x.go
/tmp/x.go:7:10: cannot use f() (value of type int) as string value in assignment
$
Note that Go 1.16 correctly the context "in multiple assignment".
Go 1.17 added a redundant error message.
Go 1.18 merged the two redundant error messages but at a loss of clarity:
- It removed the word "multiple" from "in multiple assignment".
- It falsely claims that f() is a "value of type int", despite f returning multiple values.
/cc @griesemer
Reduced from a larger program where the error was more confusing:
Note that Go 1.16 correctly the context "in multiple assignment".
Go 1.17 added a redundant error message.
Go 1.18 merged the two redundant error messages but at a loss of clarity:
/cc @griesemer