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+## New keyword argument `is_default` to `add_test_setup()`
+
+The keyword argument `is_default` may be used to set whether the test
+setup should be used by default whenever `meson test` is run without
+the `--setup` option.
+
+```meson
+add_test_setup('default', is_default: true, env: 'G_SLICE=debug-blocks')
+add_test_setup('valgrind', env: 'G_SLICE=always-malloc', ...)
+test('mytest', exe)
+```
+
+For the example above, running `meson test` and `meson test
+--setup=default` is now equivalent.