add support of feature flag for runnables #4464

Signed-off-by: Benjamin Coenen <5719034+bnjjj@users.noreply.github.com>

Author: bnjjj

crates/ra_ide/src/runnables.rs

@@ -5,7 +5,7 @@ use itertools::Itertools;
 use ra_ide_db::RootDatabase;
 use ra_syntax::{
     ast::{self, AstNode, AttrsOwner, ModuleItemOwner, NameOwner},
-    match_ast, SmolStr, SyntaxNode, TextRange,
+    match_ast, SyntaxNode, TextRange,
 };
 
 use crate::FileId;

crates/rust-analyzer/src/main_loop/handlers.rs

@@ -39,7 +39,6 @@ use crate::{
     world::WorldSnapshot,
     LspError, Result,
 };
-use hir::Attrs;
 
 pub fn handle_analyzer_status(world: WorldSnapshot, _: ()) -> Result<String> {
     let _p = profile("handle_analyzer_status");
@@ -1039,19 +1038,6 @@ fn to_lsp_runnable(
     })
 }
 
-fn get_features_needed(attrs: Attrs) -> Option<Vec<SmolStr>> {
-    let cfg_expr = attrs.by_key("cfg").tt_values().map(|subtree| ra_cfg::parse_cfg(subtree));
-    let features_needed = cfg_expr
-        .map(|cfg| {
-            let mut min_features = vec![];
-            collect_minimal_features_needed(&cfg, &mut min_features);
-            min_features
-        })
-        .flatten()
-        .collect();
-    Some(features_needed).filter(|it: &Vec<SmolStr>| !it.is_empty())
-}
-
 /// Fill minimal features needed
 fn collect_minimal_features_needed(cfg_expr: &CfgExpr, features: &mut Vec<SmolStr>) {
     match cfg_expr {