Use -Clink-dead-code

src/main.rs

@@ -73,7 +73,7 @@ fn run(args: impl IntoIterator<Item = impl Into<OsString> + Clone>) -> Result<()
         debug!(RUSTFLAGS = ?rustflags);
         // --remap-path-prefix for Sometimes macros are displayed with abs path
         rustflags.push(format!(
-            " -Zinstrument-coverage --remap-path-prefix {}/=",
+            " -Zinstrument-coverage -Clink-dead-code --remap-path-prefix {}/=",
             cx.metadata.workspace_root
         ));
 

tests/fixtures/coverage-reports/no_test/no_test.json

@@ -1 +1 @@
-{"data":[{"files":[{"filename":"src/lib.rs","summary":{"branches":{"count":0,"covered":0,"notcovered":0,"percent":0},"functions":{"count":3,"covered":3,"percent":100},"instantiations":{"count":3,"covered":3,"percent":100},"lines":{"count":3,"covered":3,"percent":100},"regions":{"count":3,"covered":3,"notcovered":0,"percent":100}}}],"totals":{"branches":{"count":0,"covered":0,"notcovered":0,"percent":0},"functions":{"count":3,"covered":3,"percent":100},"instantiations":{"count":3,"covered":3,"percent":100},"lines":{"count":3,"covered":3,"percent":100},"regions":{"count":3,"covered":3,"notcovered":0,"percent":100}}}],"type":"llvm.coverage.json.export","version":"2.0.1"}
+{"data":[{"files":[{"filename":"src/lib.rs","summary":{"branches":{"count":0,"covered":0,"notcovered":0,"percent":0},"functions":{"count":3,"covered":3,"percent":100},"instantiations":{"count":3,"covered":3,"percent":100},"lines":{"count":3,"covered":3,"percent":100},"regions":{"count":3,"covered":3,"notcovered":0,"percent":100}}},{"filename":"src/module.rs","summary":{"branches":{"count":0,"covered":0,"notcovered":0,"percent":0},"functions":{"count":1,"covered":0,"percent":0},"instantiations":{"count":1,"covered":0,"percent":0},"lines":{"count":7,"covered":0,"percent":0},"regions":{"count":6,"covered":0,"notcovered":6,"percent":0}}}],"totals":{"branches":{"count":0,"covered":0,"notcovered":0,"percent":0},"functions":{"count":4,"covered":3,"percent":75},"instantiations":{"count":4,"covered":3,"percent":75},"lines":{"count":10,"covered":3,"percent":30},"regions":{"count":9,"covered":3,"notcovered":6,"percent":33.333333333333329}}}],"type":"llvm.coverage.json.export","version":"2.0.1"}

tests/fixtures/coverage-reports/no_test/no_test.lcov.info

@@ -5,4 +5,12 @@ BRF:0
 BFH:0
 LF:3
 LH:3
+end_of_record
+SF:src/module.rs
+FNF:1
+FNH:0
+BRF:0
+BFH:0
+LF:7
+LH:0
 end_of_record

tests/fixtures/coverage-reports/no_test/no_test.summary.txt

@@ -1,5 +1,6 @@
 Filename                      Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
 -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-src/lib.rs                          3                 0   100.00%           3                 0   100.00%           3                 0   100.00%           0                 0         -
+lib.rs                              3                 0   100.00%           3                 0   100.00%           3                 0   100.00%           0                 0         -
+module.rs                           6                 6     0.00%           1                 1     0.00%           7                 7     0.00%           0                 0         -
 -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-TOTAL                               3                 0   100.00%           3                 0   100.00%           3                 0   100.00%           0                 0         -
+TOTAL                               9                 6    33.33%           4                 1    75.00%          10                 7    30.00%           0                 0         -

tests/fixtures/coverage-reports/no_test/no_test.txt

@@ -1,5 +1,16 @@
+src/lib.rs:
     1|      1|mod module;mod module;
     2|       |pub use module::*;
     3|       |
     4|      1|#[test]
-    5|      1|fn f() {}
+    5|      1|fn f() {}
+
+src/module.rs:
+    1|      0|pub fn match1(x: u32) {
+    2|      0|    match x {
+    3|      0|        0 => {}
+    4|      0|        1 => {}
+    5|      0|        2 => {}
+    6|      0|        _ => {}
+    7|       |    }
+    8|      0|}