fix(source): admit ordinary schema eight with current roundtrip coverage

crates/oa-core/src/language.rs

@@ -3,7 +3,7 @@ mod raw_tokens;
 #[path = "language/semantic_source.rs"]
 mod semantic_source;
 mod source3_bridge;
-// Staged syntax foundation only. Public source8 admission waits for complete
+// Staged typed analysis only. Public mixed source8 admission waits for complete
 // declaration lowering, source updates and the root-owned resource gate.
 #[cfg(test)]
 mod analysis_source;
@@ -338,7 +338,7 @@ fn enum_field(key: &str) -> bool {
     )
 }
 
-/// Parse V5, or explicitly migrate a valid V1/V2/V3/V4 source candidate. Parsing never
+/// Parse ordinary V8, or explicitly migrate a supported older source candidate. Parsing never
 /// adopts a model and never overwrites an editor draft.
 pub fn parse(source: &str) -> Result<Project, Vec<Diagnostic>> {
     parse_limited(source, ParseLimits::UNLIMITED)
@@ -1548,12 +1548,12 @@ impl Parser<'_> {
             if if mixed_mode {
                 self.text() != "8"
             } else {
-                !matches!(self.text(), "3" | "4" | "5" | "6" | "7")
+                !matches!(self.text(), "3" | "4" | "5" | "6" | "7" | "8")
             } {
                 return Err(self.error(if mixed_mode {
                     "Private mixed syntax requires arcadia 8."
                 } else {
-                    "Unsupported schema version: expected arcadia 3, 4, 5, 6 or 7."
+                    "Unsupported schema version: expected arcadia 3, 4, 5, 6, 7 or 8."
                 }));
             }
             let schema_version = self.text().parse().expect("checked source version");
@@ -2283,6 +2283,10 @@ pub fn analyze(source: &str) -> Analysis {
 #[path = "language_nesting_tests.rs"]
 mod nesting_tests;
 
+#[cfg(test)]
+#[path = "language_ordinary_source8_tests.rs"]
+mod ordinary_source8;
+
 pub(crate) mod legacy {
     //! Arcadia text: a readable, lossless representation of a valid OA project.
     //!