Remove unused rustc extern crates

Author: willcrichton

Cargo.lock

@@ -20,6 +20,7 @@ log = "0.4"
 fluid-let = "1.0"
 cfg-if = "1.0"
 serde = {version = "1", features = ["derive"]}
+smallvec = "1"
 rustc_utils = {workspace = true, features = ["indexical"]}
 indexical = {workspace = true}
 

crates/flowistry/Cargo.toml

@@ -50,23 +50,11 @@ extern crate polonius_engine;
 extern crate rustc_abi;
 extern crate rustc_borrowck;
 extern crate rustc_data_structures;
-extern crate rustc_driver;
-extern crate rustc_graphviz;
 extern crate rustc_hir;
-extern crate rustc_hir_pretty;
 extern crate rustc_index;
-extern crate rustc_infer;
-extern crate rustc_interface;
-extern crate rustc_macros;
 extern crate rustc_middle;
 extern crate rustc_mir_dataflow;
-extern crate rustc_mir_transform;
-extern crate rustc_serialize;
-extern crate rustc_session;
 extern crate rustc_span;
-extern crate rustc_target;
-extern crate rustc_trait_selection;
-extern crate smallvec;
 
 pub mod extensions;
 pub mod infoflow;

crates/flowistry/src/lib.rs

@@ -160,7 +160,7 @@ pub fn analyze(body_id: &BodyId, results: &FlowResults) -> Result<IssueFound> {
       stdout,
       "ERROR: insecure flow in {filename} from data at {src_span}:",
       filename = filename
-        .path(RemapPathScopeComponents::DIAGNOSTICS)        
+        .path(RemapPathScopeComponents::DIAGNOSTICS)
         .file_name()
         .unwrap()
         .to_string_lossy(),