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promql/parser: Cleanup generatedParserResult accross reuse
Reusing the same generatedParserResult ends up in strange panics: See #7131 and #7127. Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>
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@ -168,6 +168,7 @@ func newParser(input string) *parser {
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p.injecting = false
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p.parseErrors = nil
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p.generatedParserResult = nil
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// Clear lexer struct before reusing.
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p.lex = Lexer{
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