src/Compilation.zig                     | 123 ++++++++++++++++--------
 src/Sema.zig                            |  42 +++++++--
 src/Zcu.zig                             |  86 +++++++++++++++--
 src/Zcu/PerThread.zig                   |  38 +++++++-
 test/incremental/change_exports         | 161 ++++++++++++++++++++++++++++++++
 test/incremental/compile_error_then_log |   2 +
 test/incremental/compile_log            |  30 ++++++
 tools/incr-check.zig                    |  47 ++++++++--
 8 files changed, 462 insertions(+), 67 deletions(-)