Merge #1928

1928: Support `#[cfg(..)]` r=matklad a=oxalica

This PR implement `#[cfg(..)]` conditional compilation. It read default cfg options from `rustc --print cfg` with also hard-coded `test` and `debug_assertion` enabled.
Front-end settings are **not** included in this PR.

There is also a known issue that inner control attributes are totally ignored. I think it is **not** a part of `cfg` and create a separated issue for it. #1949

Fixes #1920 

Related: #1073 


Co-authored-by: uHOOCCOOHu <[email protected]>
Co-authored-by: oxalica <[email protected]>

1 files changed, 2 insertions, 1 deletions

diff --git a/crates/ra_ide_api/src/parent_module.rs b/crates/ra_ide_api/src/parent_module.rs
index c85f1d0d0..566509849 100644
--- a/crates/ra_ide_api/src/parent_module.rs
+++ b/crates/ra_ide_api/src/parent_module.rs
@@ -41,6 +41,7 @@ mod tests {
         AnalysisChange, CrateGraph,
         Edition::Edition2018,
     };
+    use ra_cfg::CfgOptions;
 
     #[test]
     fn test_resolve_parent_module() {
@@ -88,7 +89,7 @@ mod tests {
         assert!(host.analysis().crate_for(mod_file).unwrap().is_empty());
 
         let mut crate_graph = CrateGraph::default();
-        let crate_id = crate_graph.add_crate_root(root_file, Edition2018);
+        let crate_id = crate_graph.add_crate_root(root_file, Edition2018, CfgOptions::default());
         let mut change = AnalysisChange::new();
         change.set_crate_graph(crate_graph);
         host.apply_change(change);