coverage: Add a test for #[coverage(..)] on closures

Author: Zalathar

tests/coverage/coverage_attr_closure.cov-map

@@ -0,0 +1,34 @@
+Function name: coverage_attr_closure::GLOBAL_CLOSURE_ON::{closure#0}
+Raw bytes (9): 0x[01, 01, 00, 01, 01, 06, 0f, 02, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 0
+Number of file 0 mappings: 1
+- Code(Counter(0)) at (prev + 6, 15) to (start + 2, 2)
+
+Function name: coverage_attr_closure::contains_closures_off::{closure#0} (unused)
+Raw bytes (9): 0x[01, 01, 00, 01, 00, 1d, 13, 02, 06]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 0
+Number of file 0 mappings: 1
+- Code(Zero) at (prev + 29, 19) to (start + 2, 6)
+
+Function name: coverage_attr_closure::contains_closures_on
+Raw bytes (19): 0x[01, 01, 00, 03, 01, 0f, 01, 02, 05, 01, 04, 06, 02, 05, 01, 04, 06, 01, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 0
+Number of file 0 mappings: 3
+- Code(Counter(0)) at (prev + 15, 1) to (start + 2, 5)
+- Code(Counter(0)) at (prev + 4, 6) to (start + 2, 5)
+- Code(Counter(0)) at (prev + 4, 6) to (start + 1, 2)
+
+Function name: coverage_attr_closure::contains_closures_on::{closure#0} (unused)
+Raw bytes (9): 0x[01, 01, 00, 01, 00, 11, 13, 02, 06]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 0
+Number of file 0 mappings: 1
+- Code(Zero) at (prev + 17, 19) to (start + 2, 6)
+

tests/coverage/coverage_attr_closure.coverage

@@ -0,0 +1,43 @@
+   LL|       |#![feature(coverage_attribute, stmt_expr_attributes)]
+   LL|       |#![allow(dead_code)]
+   LL|       |// edition: 2021
+   LL|       |
+   LL|       |static GLOBAL_CLOSURE_ON: fn(&str) = #[coverage(on)]
+   LL|      0||input: &str| {
+   LL|      0|    println!("{input}");
+   LL|      0|};
+   LL|       |static GLOBAL_CLOSURE_OFF: fn(&str) = #[coverage(off)]
+   LL|       ||input: &str| {
+   LL|       |    println!("{input}");
+   LL|       |};
+   LL|       |
+   LL|       |#[coverage(on)]
+   LL|      1|fn contains_closures_on() {
+   LL|      1|    let _local_closure_on = #[coverage(on)]
+   LL|      1|    |input: &str| {
+   LL|      0|        println!("{input}");
+   LL|      1|    };
+   LL|      1|    let _local_closure_off = #[coverage(off)]
+   LL|      1|    |input: &str| {
+   LL|       |        println!("{input}");
+   LL|      1|    };
+   LL|      1|}
+   LL|       |
+   LL|       |#[coverage(off)]
+   LL|       |fn contains_closures_off() {
+   LL|       |    let _local_closure_on = #[coverage(on)]
+   LL|      0|    |input: &str| {
+   LL|      0|        println!("{input}");
+   LL|      0|    };
+   LL|       |    let _local_closure_off = #[coverage(off)]
+   LL|       |    |input: &str| {
+   LL|       |        println!("{input}");
+   LL|       |    };
+   LL|       |}
+   LL|       |
+   LL|       |#[coverage(off)]
+   LL|       |fn main() {
+   LL|       |    contains_closures_on();
+   LL|       |    contains_closures_off();
+   LL|       |}
+

tests/coverage/coverage_attr_closure.rs

@@ -0,0 +1,42 @@
+#![feature(coverage_attribute, stmt_expr_attributes)]
+#![allow(dead_code)]
+// edition: 2021
+
+static GLOBAL_CLOSURE_ON: fn(&str) = #[coverage(on)]
+|input: &str| {
+    println!("{input}");
+};
+static GLOBAL_CLOSURE_OFF: fn(&str) = #[coverage(off)]
+|input: &str| {
+    println!("{input}");
+};
+
+#[coverage(on)]
+fn contains_closures_on() {
+    let _local_closure_on = #[coverage(on)]
+    |input: &str| {
+        println!("{input}");
+    };
+    let _local_closure_off = #[coverage(off)]
+    |input: &str| {
+        println!("{input}");
+    };
+}
+
+#[coverage(off)]
+fn contains_closures_off() {
+    let _local_closure_on = #[coverage(on)]
+    |input: &str| {
+        println!("{input}");
+    };
+    let _local_closure_off = #[coverage(off)]
+    |input: &str| {
+        println!("{input}");
+    };
+}
+
+#[coverage(off)]
+fn main() {
+    contains_closures_on();
+    contains_closures_off();
+}