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text/template/parse: fix data race on lexer initialization
Before this change, `startParse` would write `lex.breakOK` and `lex.continueOK` when the lexer goroutine is already running, which is a potential race condition. Makes `breakOK` and `continueOK` configuration flags passed when `lexer` is created, similarly to how `emitComment` works. Fixes #53234 Change-Id: Ia65f6135509a758cd4c5a453b249a174f4fb3e21 Reviewed-on: https://go-review.googlesource.com/c/go/+/410414 Reviewed-by: Eli Bendersky <eliben@google.com> Reviewed-by: Daniel Martí <mvdan@mvdan.cc> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Rob Pike <r@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> Run-TryBot: Ian Lance Taylor <iant@golang.org>
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