[pull] master from ruby:master#1224
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The heredoc handler in parse_expression_prefix stores the address of its stack-local common_whitespace into the heredoc lex mode. When the heredoc terminator is missing, expect1_heredoc_term reports an error without popping the lex mode, so the stored pointer outlives the stack frame and subsequent lexing reads dead stack memory. Clear the pointer before leaving the handler; the lexer already guards against NULL. ruby/prism@70519ed720 Co-authored-by: Claude <noreply@anthropic.com>
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