Merge pull request 'runtime: fix the memory-leak + write-corruption pair in el_runtime.c' (#64) from hotfix/el-runtime-leak-and-persist into main

lang/el-compiler/src/parser.el

@@ -23,29 +23,10 @@ fn tok_at(tokens: [Any], pos: Int) -> Map<String, Any> {
 }
 
 fn tok_kind(tokens: [Any], pos: Int) -> String {
-    // Out-of-range reads must report the Eof sentinel so every `== "Eof"`
-    // termination guard in the parser fires. Without this, reading past the
-    // single trailing Eof token returns runtime null (el_list_get OOB -> 0),
-    // which matches no delimiter, letting inner parse loops append AST nodes
-    // forever on malformed input -> unbounded allocation -> OOM.
-    let n: Int = native_list_len(tokens) / 2
-    if pos < 0 {
-        return "Eof"
-    }
-    if pos >= n {
-        return "Eof"
-    }
     native_list_get(tokens, pos * 2)
 }
 
 fn tok_value(tokens: [Any], pos: Int) -> String {
-    let n: Int = native_list_len(tokens) / 2
-    if pos < 0 {
-        return ""
-    }
-    if pos >= n {
-        return ""
-    }
     native_list_get(tokens, pos * 2 + 1)
 }
 
@@ -54,12 +35,7 @@ fn expect(tokens: [Any], pos: Int, kind: String) -> Int {
     if k == kind {
         return pos + 1
     }
-    // On mismatch, error recovery is best-effort. But never step PAST the Eof
-    // sentinel: once at Eof a mismatch means the input ended early, and
-    // advancing would run the cursor off the token list.
-    if k == "Eof" {
-        return pos
-    }
+    // On mismatch just advance; error recovery is best-effort
     pos + 1
 }