Segfault when getting syntax tree of function with nested sublist extraction of level 3 (or more)

[zickgraf]

Observed behaviour

gap> func := function ( x ) return [ [ [ 1 ] ] ]{[ 1 ]}{[ 1 ]}{[ 1 ]}; end;
function( x ) ... end
gap> func( 1 );
[ [ [ 1 ] ] ]
gap> SYNTAX_TREE( func );
zsh: segmentation fault (core dumped)  gap

Expected behaviour

No segfault.

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