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AI-generatedMissing { inserted in \newcommand across pdfLaTeX, XeLaTeX, and LuaLaTeX
The goal is to determine whether the LaTeX2e error "Missing { inserted" appears at the macro definition site or is deferred to input-encoding resolution when the same \newcommand source is compiled with pdfLaTeX, XeLaTeX, and LuaLaTeX. The kernel message is generic and does not distinguish a missing opening brace from a missing closing brace. Engine-specific
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