Embed noCopy struct into structs, which mustn't be copied

This should help `go vet` detecting invalid structs' copyings.
See golang/go#8005 (comment) for details.

Author: valyala

args.go

@@ -39,6 +39,8 @@ type Args struct {
 	args  []argsKV
 	bufKV argsKV
 	buf   []byte
+
+	noCopy
 }
 
 type argsKV struct {

client.go

@@ -201,6 +201,8 @@ type Client struct {
 	mLock sync.Mutex
 	m     map[string]*HostClient
 	ms    map[string]*HostClient
+
+	noCopy
 }
 
 // Get appends url contents to dst and returns it as body.
@@ -511,6 +513,8 @@ type HostClient struct {
 
 	readerPool sync.Pool
 	writerPool sync.Pool
+
+	noCopy
 }
 
 type clientConn struct {

cookie.go

@@ -55,6 +55,8 @@ type Cookie struct {
 
 	bufKV argsKV
 	buf   []byte
+
+	noCopy
 }
 
 // CopyTo copies src cookie to c.

header.go

@@ -33,6 +33,8 @@ type ResponseHeader struct {
 	bufKV argsKV
 
 	cookies []argsKV
+
+	noCopy
 }
 
 // RequestHeader represents HTTP request header.
@@ -68,6 +70,8 @@ type RequestHeader struct {
 	cookies []argsKV
 
 	rawHeaders []byte
+
+	noCopy
 }
 
 // SetContentRange sets 'Content-Range: bytes startPos-endPos/contentLength'

http.go

@@ -37,6 +37,8 @@ type Request struct {
 	// Group bool members in order to reduce Request object size.
 	parsedURI      bool
 	parsedPostArgs bool
+
+	noCopy
 }
 
 // Response represents HTTP response.
@@ -62,6 +64,8 @@ type Response struct {
 	// Response.Write() skips writing body if set to true.
 	// Use it for writing HEAD responses.
 	SkipBody bool
+
+	noCopy
 }
 
 // SetRequestURI sets RequestURI.

nocopy.go

@@ -0,0 +1,8 @@
+package fasthttp
+
+// Embed this type into a struct, which mustn't be copied,
+// so `go vet` gives a warning if this struct is copied.
+//
+// See https://github.com/golang/go/issues/8005#issuecomment-190753527 for details.
+type noCopy struct {}
+func (*noCopy) Lock() {}

server.go

@@ -270,6 +270,8 @@ type Server struct {
 	writerPool     sync.Pool
 	hijackConnPool sync.Pool
 	bytePool       sync.Pool
+
+	noCopy
 }
 
 // TimeoutHandler creates RequestHandler, which returns StatusRequestTimeout
@@ -374,6 +376,8 @@ type RequestCtx struct {
 	timeoutTimer    *time.Timer
 
 	hijackHandler HijackHandler
+
+	noCopy
 }
 
 // HijackHandler must process the hijacked connection c.

uri.go

@@ -50,6 +50,8 @@ type URI struct {
 	requestURI []byte
 
 	h *RequestHeader
+
+	noCopy
 }
 
 // CopyTo copies uri contents to dst.