vrepl: fix optional call

cmd/tools/vrepl.v

@@ -198,7 +198,7 @@ fn run_repl(workdir string, vrepl_prefix string) {
 				'=', '++', '--', '<<',
 				'//', '/*',
 				'fn ', 'pub ', 'mut ', 'enum ', 'const ', 'struct ', 'interface ', 'import ',
-				'#include ', ':=', 'for '
+				'#include ', ':=', 'for ', 'or '
 			]
 			mut is_statement := false
 			for pattern in possible_statement_patterns {

vlib/v/tests/repl/optional_call.repl

@@ -0,0 +1,3 @@
+import os
+os.cp('', '') or {return} 
+===output===