build.zig                                   |   4 +
 lib/std/io.zig                              | 192 +++++++++++++++++++++++++-----
 test/incremental/add_decl                   |   1 +
 test/incremental/add_decl_namespaced        |   1 +
 test/incremental/delete_comptime_decls      |   1 +
 test/incremental/hello                      |   1 +
 test/incremental/modify_inline_fn           |   1 +
 test/incremental/move_src                   |   1 +
 test/incremental/remove_enum_field          |   1 +
 test/incremental/type_becomes_comptime_only |   1 +
 test/incremental/unreferenced_error         |   1 +
 test/tests.zig                              |  28 +++++
 tools/incr-check.zig                        | 200 ++++++++++++++++++++++++--------
 13 files changed, 354 insertions(+), 79 deletions(-)