crash while marking used variables #6456
Description
Environment Information
jruby 9.3.0.0-SNAPSHOT (2.6.5) 2020-11-06 f1d8b25 Java HotSpot(TM) 64-Bit Server VM 11.0.1+13-LTS on 11.0.1+13-LTS +jit [mswin32-x86_64]
Reproduction
require 'erb'
$VERBOSE = true
def call
input = "<% x = [].each {}; data = '' %>"
engine = ::ERB.new(input, trim_mode: '<>')
data = engine.result(binding)
data
end
callrelated 397fd1c
Expected Behavior
the script shouldn't raise an exception
Actual Behavior
Unhandled Java exception: java.lang.NullPointerException
java.lang.NullPointerException: null
markUsedVariable at org/jruby/parser/ScopedParserState.java:86
addOrMarkVariable at org/jruby/parser/ParserSupport.java:213
assignableLabelOrIdentifier at org/jruby/parser/ParserSupport.java:204
execute at org/jruby/parser/RubyParser.java:2405
yyparse at org/jruby/parser/RubyParser.java:1724
yyparse at org/jruby/parser/RubyParser.java:1597
parse at org/jruby/parser/RubyParser.java:5764
parse at org/jruby/parser/Parser.java:133
parse at org/jruby/parser/Parser.java:81
parseEval at org/jruby/Ruby.java:2618
prepareIC at org/jruby/ir/interpreter/Interpreter.java:193
evalCommon at org/jruby/ir/interpreter/Interpreter.java:150
evalWithBinding at org/jruby/ir/interpreter/Interpreter.java:182
evalCommon at org/jruby/RubyKernel.java:1160
eval at org/jruby/RubyKernel.java:1122
call at org/jruby/RubyKernel$INVOKER$s$0$3$eval.gen:-1
cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:328
call at org/jruby/runtime/callsite/CachingCallSite.java:86
interpret at org/jruby/ir/instructions/CallBase.java:549
processCall at org/jruby/ir/interpreter/InterpreterEngine.java:361
interpret at org/jruby/ir/interpreter/StartupInterpreterEngine.java:72
interpret at org/jruby/ir/interpreter/InterpreterEngine.java:86
INTERPRET_METHOD at org/jruby/internal/runtime/methods/MixedModeIRMethod.java:156
call at org/jruby/internal/runtime/methods/MixedModeIRMethod.java:143
call at org/jruby/internal/runtime/methods/DynamicMethod.java:203
cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:371
call at org/jruby/runtime/callsite/CachingCallSite.java:174
invokeOther3:result at erbi.rb:8
call at erbi.rb:8
call at org/jruby/internal/runtime/methods/CompiledIRMethod.java:185
cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:350
call at org/jruby/runtime/callsite/CachingCallSite.java:143
invokeOther4:call at erbi.rb:12
<main> at erbi.rb:12
run at erbi.rb:-1
invokeWithArguments at java/lang/invoke/MethodHandle.java:710
load at org/jruby/ir/Compiler.java:114
runScript at org/jruby/Ruby.java:1253
runNormally at org/jruby/Ruby.java:1172
runNormally at org/jruby/Ruby.java:1154
runNormally at org/jruby/Ruby.java:1190
runFromMain at org/jruby/Ruby.java:973
doRunFromMain at org/jruby/Main.java:393
internalRun at org/jruby/Main.java:287
run at org/jruby/Main.java:234
main at org/jruby/Main.java:206