Add more tests for cfg(version)

Author: mibac138

src/librustc_attr/builtin.rs

@@ -652,8 +652,7 @@ pub fn eval_condition(
                     return false;
                 }
             };
-            let version = option_env!("CFG_VERSION").unwrap_or("unknown rustc version");
-            let version = Version::parse(version).unwrap();
+            let version = Version::parse(env!("CFG_VERSION")).unwrap();
 
             version >= min_version
         }

src/test/ui/feature-gates/feature-gate-cfg-version.rs

@@ -17,14 +17,24 @@ fn bar() -> bool  { false }
 #[cfg(version("999"))]
 //~^ ERROR `cfg(version)` is experimental and subject to change
 fn bar() -> bool  { false }
-#[cfg(version("999"))]
+#[cfg(version("-1"))] //~ ERROR: invalid version literal
+//~^ ERROR `cfg(version)` is experimental and subject to change
+fn bar() -> bool  { false }
+#[cfg(version("65536"))] //~ ERROR: invalid version literal
 //~^ ERROR `cfg(version)` is experimental and subject to change
 fn bar() -> bool  { false }
 #[cfg(version("0"))]
 //~^ ERROR `cfg(version)` is experimental and subject to change
 fn bar() -> bool { true }
 
+#[cfg(version("1.65536.2"))]
+//~^ ERROR `cfg(version)` is experimental and subject to change
+fn version_check_bug() {}
+
 fn main() {
+    // This should fail but due to a bug in version_check `1.65536.2` is interpreted as `1.2`.
+    // See https://github.com/SergioBenitez/version_check/issues/11
+    version_check_bug();
     assert!(foo());
     assert!(bar());
     assert!(cfg!(version("1.42"))); //~ ERROR `cfg(version)` is experimental and subject to change

src/test/ui/feature-gates/feature-gate-cfg-version.stderr

@@ -73,21 +73,60 @@ LL | #[cfg(version("999"))]
 error[E0658]: `cfg(version)` is experimental and subject to change
   --> $DIR/feature-gate-cfg-version.rs:20:7
    |
+LL | #[cfg(version("-1"))]
+   |       ^^^^^^^^^^^^^
+   |
+   = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
+   = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+
+error: invalid version literal
+  --> $DIR/feature-gate-cfg-version.rs:20:15
+   |
+LL | #[cfg(version("-1"))]
+   |               ^^^^
+
+error[E0658]: `cfg(version)` is experimental and subject to change
+  --> $DIR/feature-gate-cfg-version.rs:23:7
+   |
+LL | #[cfg(version("65536"))]
+   |       ^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
+   = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+
+error: invalid version literal
+  --> $DIR/feature-gate-cfg-version.rs:23:15
+   |
+LL | #[cfg(version("65536"))]
+   |               ^^^^^^^
+
+error[E0658]: `cfg(version)` is experimental and subject to change
+  --> $DIR/feature-gate-cfg-version.rs:26:7
+   |
 LL | #[cfg(version("0"))]
    |       ^^^^^^^^^^^^
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
 
 error[E0658]: `cfg(version)` is experimental and subject to change
-  --> $DIR/feature-gate-cfg-version.rs:27:18
+  --> $DIR/feature-gate-cfg-version.rs:30:7
+   |
+LL | #[cfg(version("1.65536.2"))]
+   |       ^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
+   = help: add `#![feature(cfg_version)]` to the crate attributes to enable
+
+error[E0658]: `cfg(version)` is experimental and subject to change
+  --> $DIR/feature-gate-cfg-version.rs:40:18
    |
 LL |     assert!(cfg!(version("1.42")));
    |                  ^^^^^^^^^^^^^^^
    |
    = note: see issue #64796 <https://github.com/rust-lang/rust/issues/64796> for more information
    = help: add `#![feature(cfg_version)]` to the crate attributes to enable
 
-error: aborting due to 11 previous errors
+error: aborting due to 16 previous errors
 
 For more information about this error, try `rustc --explain E0658`.