string cloning; fix foo.str += 's'

vlib/builtin/builtin.v

@@ -76,18 +76,6 @@ pub fn panic(s string) {
 	C.exit(1)
 }
 
-pub fn println(s string) {
-	// Should never happen
-	if isnil(s.str) {
-		panic('println(NIL)')
-	}
-	$if windows {
-		C._putws(s.to_wide())
-	} $else {
-		C.printf('%.*s\n', s.len, s.str)
-	}
-}
-
 pub fn eprintln(s string) {
 	if isnil(s.str) {
 		panic('eprintln(NIL)')

vlib/builtin/builtin_nix.v

@@ -4,6 +4,10 @@
 
 module builtin
 
+pub fn println(s string) {
+	C.printf('%.*s\n', s.len, s.str)
+}
+
 fn print_backtrace_skipping_top_frames_msvc(skipframes int) bool {
 	println('not implemented, see builtin_windows.v')
 	return false

vlib/builtin/builtin_windows.v

@@ -73,7 +73,7 @@ $if msvc {
 
 	handle := C.GetCurrentProcess()
 	defer { C.SymCleanup(handle) }
-	
+
 	options := C.SymSetOptions(SYMOPT_DEBUG | SYMOPT_LOAD_LINES | SYMOPT_UNDNAME)
 	syminitok := C.SymInitialize( handle, 0, 1)
 	if syminitok != 1 {
@@ -133,3 +133,8 @@ fn print_backtrace_skipping_top_frames_nix(skipframes int) bool {
 	println('not implemented, see builtin_nix.v')
 	return false
 }
+
+pub fn println(s string) {
+	C._putws(s.to_wide())
+}
+