Rollup merge of rust-lang#78425 - chansuke:move_nan, r=jyn514

Move f64::NAN ui tests into `library` This is a partial fix of rust-lang#76268. r? ```@matklad```
m-ou-se · Nov 5, 2020 · 9922933 · 9922933
2 parents 10d2843 + f9b139f
commit 9922933
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diff --git a/library/core/tests/num/mod.rs b/library/core/tests/num/mod.rs
@@ -27,6 +27,8 @@ mod bignum;
 mod dec2flt;
 mod flt2dec;
 
+mod nan;
+
 /// Adds the attribute to all items in the block.
 macro_rules! cfg_block {
     ($(#[$attr:meta]{$($it:item)*})*) => {$($(

diff --git a/src/test/ui/format-nan.rs → library/core/tests/num/nan.rs b/src/test/ui/format-nan.rs → library/core/tests/num/nan.rs
@@ -1,7 +1,6 @@
-// run-pass
-
-pub fn main() {
-    use std::f64;
+#[test]
+fn test_nan() {
+    use core::f64;
     let x = "NaN".to_string();
     assert_eq!(format!("{}", f64::NAN), x);
     assert_eq!(format!("{:e}", f64::NAN), x);