[PRISM] Allow space before encoding comment

Author: kddnewton

prism/prism.c

@@ -19359,6 +19359,11 @@ pm_parser_init(pm_parser_t *parser, const uint8_t *source, size_t size, const pm
             pm_newline_list_clear(&parser->newline_list);
         }
     }
+
+    // The encoding comment can start after any amount of inline whitespace, so
+    // here we'll advance it to the first non-inline-whitespace character so
+    // that it is ready for future comparisons.
+    parser->encoding_comment_start += pm_strspn_inline_whitespace(parser->encoding_comment_start, parser->end - parser->encoding_comment_start);
 }
 
 /**

spec/prism.mspec

@@ -29,8 +29,6 @@ MSpec.register(:exclude, "A Symbol literal raises an SyntaxError at parse time w
 ## Core
 MSpec.register(:exclude, "IO.popen with a leading Array argument accepts a trailing Hash of Process.exec options")
 MSpec.register(:exclude, "IO.popen with a leading Array argument accepts an IO mode argument following the Array")
-MSpec.register(:exclude, "Kernel#eval with a magic encoding comment allows spaces before the magic encoding comment")
-MSpec.register(:exclude, "Kernel#eval with a magic encoding comment allows a shebang line and some spaces before the magic encoding comment")
 MSpec.register(:exclude, "TracePoint#eval_script is the evald source code")
 MSpec.register(:exclude, "TracePoint#event returns the type of event")
 MSpec.register(:exclude, "TracePoint#inspect returns a String showing the event, method, path and line for a :return event")