[mypyc] Avoid mutating the AST when processing singledispatch register calls
#10779
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Instead of modifying dec.decorators directly, copy it and only modify the copied version. That prevents us from modifying the AST in mypyc, which we should avoid according to python#10753 (comment).
pranavrajpal
changed the title
register callsregister calls
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This PR makes mypyc avoid mutating the AST while searching decorators for any singledispatch
registercalls, as requested in #10753 (comment).