Merge pull request #722 from matklad/test-ignore-children

test ignored out of line modules

tests/source/mod_skip_child.rs

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+// rustfmt-skip_children: true
+mod nested_skipped;

tests/source/nested_skipped/mod.rs

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+fn ugly() {
+92;
+}

tests/target/mod_skip_child.rs

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+// rustfmt-skip_children: true
+mod nested_skipped;

tests/target/nested_skipped/mod.rs

@@ -0,0 +1,3 @@
+fn ugly() {
+92;
+}