\input expl3-generic
\ExplSyntaxOff  % warning on this line
\ExplSyntaxOn
\tl_new:N
 \g_example_tl
\tl_gset:Nn
 \g_example_tl
 { Hello,~ }
\ExplSyntaxOn  % warning on this line
\tl_gput_right:Nn
 \g_example_tl
 { world! }
\tl_use:N
 \g_example_tl

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