Auto merge of #12926 - epage:exact, r=Eh2406

refactor(util): Prepare for splitting out semver logic

### What does this PR try to resolve?

Like #12924, this was cleanup I noticed as I was looking to pull out our reusable semver code for #12801

### How should we test and review this PR?

### Additional information

src/bin/cargo/commands/install.rs

@@ -6,7 +6,7 @@ use anyhow::format_err;
 use cargo::core::{GitReference, SourceId, Workspace};
 use cargo::ops;
 use cargo::util::IntoUrl;
-use cargo::util::VersionReqExt;
+use cargo::util::VersionExt;
 use cargo::CargoResult;
 use itertools::Itertools;
 use semver::VersionReq;
@@ -263,8 +263,8 @@ fn parse_semver_flag(v: &str) -> CargoResult<VersionReq> {
             ),
         }
     } else {
-        match v.trim().parse() {
+        match v.trim().parse::<semver::Version>() {
-            Ok(v) => Ok(VersionReq::exact(&v)),
+            Ok(v) => Ok(v.to_exact_req()),
             Err(e) => {
                 let mut msg = e.to_string();
 

src/cargo/core/package_id_spec.rs

@@ -153,7 +153,7 @@ impl PackageIdSpec {
 
     /// Full `semver::Version`, if present
     pub fn version(&self) -> Option<Version> {
-        self.version.as_ref().and_then(|v| v.version())
+        self.version.as_ref().and_then(|v| v.to_version())
     }
 
     pub fn partial_version(&self) -> Option<&PartialVersion> {

src/cargo/ops/cargo_compile/mod.rs

@@ -493,7 +493,7 @@ pub fn create_bcx<'a, 'cfg>(
                 continue;
             };
 
-            let req = version.caret_req();
+            let req = version.to_caret_req();
             if req.matches(&untagged_version) {
                 continue;
             }

src/cargo/ops/common_for_install_and_uninstall.rs

@@ -555,7 +555,7 @@ where
     match deps.iter().max_by_key(|p| p.package_id()) {
         Some(summary) => {
             if let (Some(current), Some(msrv)) = (current_rust_version, summary.rust_version()) {
-                let msrv_req = msrv.caret_req();
+                let msrv_req = msrv.to_caret_req();
                 if !msrv_req.matches(current) {
                     let name = summary.name();
                     let ver = summary.version();
@@ -574,7 +574,7 @@ where
                             .filter(|summary| {
                                 summary
                                     .rust_version()
-                                    .map(|msrv| msrv.caret_req().matches(current))
+                                    .map(|msrv| msrv.to_caret_req().matches(current))
                                     .unwrap_or(true)
                             })
                             .max_by_key(|s| s.package_id())

src/cargo/util/mod.rs

@@ -23,7 +23,7 @@ pub use self::progress::{Progress, ProgressStyle};
 pub use self::queue::Queue;
 pub use self::restricted_names::validate_package_name;
 pub use self::rustc::Rustc;
-pub use self::semver_ext::{OptVersionReq, PartialVersion, RustVersion, VersionExt, VersionReqExt};
+pub use self::semver_ext::{OptVersionReq, PartialVersion, RustVersion, VersionExt};
 pub use self::vcs::{existing_vcs_repo, FossilRepo, GitRepo, HgRepo, PijulRepo};
 pub use self::workspace::{
     add_path_args, path_args, print_available_benches, print_available_binaries,

src/cargo/util/semver_ext.rs

@@ -14,27 +14,23 @@ pub enum OptVersionReq {
 
 pub trait VersionExt {
     fn is_prerelease(&self) -> bool;
-}
 
-pub trait VersionReqExt {
+    fn to_exact_req(&self) -> VersionReq;
-    fn exact(version: &Version) -> Self;
 }
 
 impl VersionExt for Version {
     fn is_prerelease(&self) -> bool {
         !self.pre.is_empty()
     }
-}
 
-impl VersionReqExt for VersionReq {
+    fn to_exact_req(&self) -> VersionReq {
-    fn exact(version: &Version) -> Self {
         VersionReq {
             comparators: vec![Comparator {
                 op: Op::Exact,
-                major: version.major,
+                major: self.major,
-                minor: Some(version.minor),
+                minor: Some(self.minor),
-                patch: Some(version.patch),
+                patch: Some(self.patch),
-                pre: version.pre.clone(),
+                pre: self.pre.clone(),
             }],
         }
     }
@@ -42,14 +38,14 @@ impl VersionReqExt for VersionReq {
 
 impl OptVersionReq {
     pub fn exact(version: &Version) -> Self {
-        OptVersionReq::Req(VersionReq::exact(version))
+        OptVersionReq::Req(version.to_exact_req())
     }
 
     // Since some registries have allowed crate versions to differ only by build metadata,
     // A query using OptVersionReq::exact return nondeterministic results.
     // So we `lock_to` the exact version were interested in.
     pub fn lock_to_exact(version: &Version) -> Self {
-        OptVersionReq::Locked(version.clone(), VersionReq::exact(version))
+        OptVersionReq::Locked(version.clone(), version.to_exact_req())
     }
 
     pub fn is_exact(&self) -> bool {
@@ -205,7 +201,7 @@ pub struct PartialVersion {
 }
 
 impl PartialVersion {
-    pub fn version(&self) -> Option<Version> {
+    pub fn to_version(&self) -> Option<Version> {
         Some(Version {
             major: self.major,
             minor: self.minor?,
@@ -215,7 +211,7 @@ impl PartialVersion {
         })
     }
 
-    pub fn caret_req(&self) -> VersionReq {
+    pub fn to_caret_req(&self) -> VersionReq {
         VersionReq {
             comparators: vec![Comparator {
                 op: semver::Op::Caret,

src/cargo/util/toml/mod.rs

@@ -568,7 +568,7 @@ impl schema::TomlManifest {
             let rust_version = rust_version
                 .clone()
                 .resolve("rust_version", || inherit()?.rust_version())?;
-            let req = rust_version.caret_req();
+            let req = rust_version.to_caret_req();
             if let Some(first_version) = edition.first_version() {
                 let unsupported =
                     semver::Version::new(first_version.major, first_version.minor - 1, 9999);