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Christian and I both unwittingly used it in form: *tal_arr_expand(&x) = tal(x, ...) Since '=' isn't a sequence point, the compiler can (and does!) cache the value of x, handing it to tal *after* tal_arr_expand() moves it due to tal_resize(). The new version is somewhat less convenient to use, but doesn't have this problem, since the assignment is always evaluated after the resize. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>