diff options
Diffstat (limited to 'src/go/types/signature.go')
| -rw-r--r-- | src/go/types/signature.go | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/src/go/types/signature.go b/src/go/types/signature.go index a340ac701ea..d22646d7a87 100644 --- a/src/go/types/signature.go +++ b/src/go/types/signature.go @@ -5,6 +5,7 @@ package types import ( + "fmt" "go/ast" "go/token" ) @@ -41,16 +42,18 @@ func NewSignature(recv *Var, params, results *Tuple, variadic bool) *Signature { // NewSignatureType creates a new function type for the given receiver, // receiver type parameters, type parameters, parameters, and results. If // variadic is set, params must hold at least one parameter and the last -// parameter must be of unnamed slice type. If recv is non-nil, typeParams must -// be empty. If recvTypeParams is non-empty, recv must be non-nil. +// parameter's core type must be of unnamed slice or bytestring type. +// If recv is non-nil, typeParams must be empty. If recvTypeParams is +// non-empty, recv must be non-nil. func NewSignatureType(recv *Var, recvTypeParams, typeParams []*TypeParam, params, results *Tuple, variadic bool) *Signature { if variadic { n := params.Len() if n == 0 { panic("variadic function must have at least one parameter") } - if _, ok := params.At(n - 1).typ.(*Slice); !ok { - panic("variadic parameter must be of unnamed slice type") + core := coreString(params.At(n - 1).typ) + if _, ok := core.(*Slice); !ok && !isString(core) { + panic(fmt.Sprintf("got %s, want variadic parameter with unnamed slice type or string as core type", core.String())) } } sig := &Signature{recv: recv, params: params, results: results, variadic: variadic} |