tree 0315cdc0b7c6bef3a40ea1354a2d7ef2401924a2
parent dfcb5a1e1042f2debae1ca11405d5d2e508e50c5
author Alastair Donaldson <afdx@google.com> 1561559545 +0100
committer GitHub <noreply@github.com> 1561559545 +0100
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Disallow movement of unreachable blocks. (#2700)

Fixes #2695.  Allowing unreachable blocks to be moved can lead to an
unreachable block A getting placed after an unreachable successor B,
which is a problem if B uses ids that A generates.