And old named snapshot metadata formats

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to insta and cargo-insta are documented here.
 
 ## 1.40.0
 
-- Print a warning for old inline snapshot formats.
+- Print a warning when encountering old snapshot formats.  #503
 
 ## 1.39.0
 

insta/src/env.rs

@@ -101,6 +101,7 @@ pub struct ToolConfig {
     require_full_match: bool,
     output: OutputBehavior,
     snapshot_update: SnapshotUpdate,
+    // minimum_insta_version: Option<Version>,
     #[cfg(feature = "glob")]
     glob_fail_fast: bool,
     #[cfg(feature = "_cargo_insta_internal")]

insta/src/snapshot.rs

@@ -313,6 +313,7 @@ impl Snapshot {
                     }
                 }
             }
+            eprintln!("A snapshot uses an old snapshot format; please update it to the new format with `cargo insta --force-update-snapshots.\n\nSnapshot is at: {}", p.to_string_lossy());
             rv
         };
 
@@ -670,7 +671,7 @@ fn get_inline_snapshot_value(frozen_value: &str) -> String {
     // (the only call site)
 
     if frozen_value.trim_start().starts_with('⋮') {
-        eprintln!("Value uses an old snapshot format; please update it to the new format with `cargo insta --force-update-snapshots.\n\nValue: {}", frozen_value);
+        eprintln!("A snapshot uses an old snapshot format; please update it to the new format with `cargo insta --force-update-snapshots.\n\nValue: {}", frozen_value);
 
         // legacy format - retain so old snapshots still work
         let mut buf = String::new();