Remove krate.version; fix crate_version in JSON

Previously, `JsonRenderer::after_krate` called `krate.version.clone()`.
The problem was it did that after the version was already moved into the
cache, so it would always be None. The fix was to get the version from
the cache instead.

Author: jyn514

src/librustdoc/clean/types.rs

@@ -50,7 +50,6 @@ thread_local!(crate static MAX_DEF_IDX: RefCell<FxHashMap<CrateNum, DefIndex>> =
 #[derive(Clone, Debug)]
 crate struct Crate {
     crate name: Symbol,
-    crate version: Option<String>,
     crate src: FileName,
     crate module: Option<Item>,
     crate externs: Vec<(CrateNum, ExternalCrate)>,

src/librustdoc/clean/utils.rs

@@ -77,7 +77,6 @@ crate fn krate(cx: &mut DocContext<'_>) -> Crate {
 
     Crate {
         name,
-        version: None,
         src,
         module: Some(module),
         externs,

src/librustdoc/formats/cache.rs

@@ -144,7 +144,6 @@ impl Cache {
         dst: &Path,
     ) -> clean::Crate {
         // Crawl the crate to build various caches used for the output
-        self.crate_version = krate.version.take();
         debug!(?self.crate_version);
         self.traits = krate.external_traits.take();
         self.masked_crates = mem::take(&mut krate.masked_crates);

src/librustdoc/json/mod.rs

@@ -199,7 +199,7 @@ impl<'tcx> FormatRenderer<'tcx> for JsonRenderer<'tcx> {
 
     fn after_krate(
         &mut self,
-        krate: &clean::Crate,
+        _krate: &clean::Crate,
         _diag: &rustc_errors::Handler,
     ) -> Result<(), Error> {
         debug!("Done with crate");
@@ -210,7 +210,7 @@ impl<'tcx> FormatRenderer<'tcx> for JsonRenderer<'tcx> {
         #[allow(rustc::default_hash_types)]
         let output = types::Crate {
             root: types::Id(String::from("0:0")),
-            crate_version: krate.version.clone(),
+            crate_version: self.cache.crate_version.clone(),
             includes_private: self.cache.document_private,
             index: index.into_iter().collect(),
             paths: self

src/test/rustdoc-json/nested.rs

@@ -1,6 +1,8 @@
 // edition:2018
+// compile-flags: --crate-version 1.0.0
 
-// @is nested.json "$.index[*][?(@.name=='nested')].kind" \"module\"
+// @is nested.json "$.crate_version" \"1.0.0\"
+// @is - "$.index[*][?(@.name=='nested')].kind" \"module\"
 // @is - "$.index[*][?(@.name=='nested')].inner.is_crate" true
 // @count - "$.index[*][?(@.name=='nested')].inner.items[*]" 1