The following code stopped working in 1.001. It works fine in 1.00: void main() { auto rs = std.string.split("a\tb\nc\td\ne\tf","\n"); assert(rs.length==3); foreach(r;rs) { auto f = std.string.split(r,"\t"); assert(f.length==2); } } std.string did not change, so I suspect there's something in the GC :( L.