How to use matcharg(2)[1] to set search register?

2match has been set and is working.

:echo matcharg(2)[1] returns the correct pattern.

Why does this not set the search register?

let @/=matcharg(2)[1]

matcharg({nr}) *matcharg()*
Selects the {nr} match item, as set with a |:match|,
|:2match| or |:3match| command.
Return a |List| with two elements:
The name of the highlight group used
The pattern used.

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