Rename stuff for clarity

- generate_{auto => default}_target since it matches on CompileFilter::Default
- CompileFilter::{matches => target_run} to make it clear it only affects `cargo run`
- Add a comment pointing to generate_target for other subcommands

src/cargo/ops/cargo_compile.rs

@@ -458,7 +458,9 @@ impl CompileFilter {
         }
     }
 
-    pub fn matches(&self, target: &Target) -> bool {
+    // this selects targets for "cargo run". for logic to select targets for
+    // other subcommands, see generate_targets and generate_default_targets
+    pub fn target_run(&self, target: &Target) -> bool {
         match *self {
             CompileFilter::Default { .. } => true,
             CompileFilter::Only {
@@ -497,7 +499,7 @@ struct BuildProposal<'a> {
     required: bool,
 }
 
-fn generate_auto_targets<'a>(
+fn generate_default_targets<'a>(
     mode: CompileMode,
     targets: &'a [Target],
     profile: &'a Profile,
@@ -719,7 +721,7 @@ fn generate_targets<'a>(
             } else {
                 &profiles.test_deps
             };
-            generate_auto_targets(
+            generate_default_targets(
                 mode,
                 pkg.targets(),
                 profile,

src/cargo/ops/cargo_run.rs

@@ -33,7 +33,7 @@ pub fn run(
             !a.is_lib() && !a.is_custom_build() && if !options.filter.is_specific() {
                 a.is_bin()
             } else {
-                options.filter.matches(a)
+                options.filter.target_run(a)
             }
         })
         .map(|bin| bin.name())