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If we put the SAVE_EXPR for a VLA size inside the MINUS_EXPR rather than outside, it will work better with constant folding. The equivalent change was made in the C front-end in 2004, in commit r0-64535-g8b0b9aefd29dfe6398857bcf5628662e2f0e21f6 gcc/cp/ChangeLog 2020-05-11 Jason Merrill <jason@redhat.com> * decl.c (compute_array_index_type_loc): Stabilize before building the MINUS_EXPR.
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