fix: cairo1-run array argument's length can not be less than 2

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 #### Upcoming Changes
 
+* fix: add support for arrays shorter than 2 as arguments for cairo1-run [#1737](https://github.com/lambdaclass/cairo-vm/pull/1737)
+
 * Serialize directly into writer in `CairoPie::write_zip_file`[#1736](https://github.com/lambdaclass/cairo-vm/pull/1736)
 
 * feat: Add support for cairo1 run with segements arena validation.

cairo1-run/src/main.rs

@@ -69,24 +69,36 @@ fn process_args(value: &str) -> Result<FuncArgs, String> {
     while let Some(value) = input.next() {
         // First argument in an array
         if value.starts_with('[') {
-            let mut array_arg =
-                vec![Felt252::from_dec_str(value.strip_prefix('[').unwrap()).unwrap()];
-            // Process following args in array
-            let mut array_end = false;
-            while !array_end {
-                if let Some(value) = input.next() {
-                    // Last arg in array
-                    if value.ends_with(']') {
-                        array_arg
-                            .push(Felt252::from_dec_str(value.strip_suffix(']').unwrap()).unwrap());
-                        array_end = true;
-                    } else {
-                        array_arg.push(Felt252::from_dec_str(value).unwrap())
+            if value.ends_with(']') {
+                if value.len() == 2 {
+                    args.push(FuncArg::Array(Vec::new()));
+                } else {
+                    args.push(FuncArg::Array(vec![Felt252::from_dec_str(
+                        value.strip_prefix('[').unwrap().strip_suffix(']').unwrap(),
+                    )
+                    .unwrap()]));
+                }
+            } else {
+                let mut array_arg =
+                    vec![Felt252::from_dec_str(value.strip_prefix('[').unwrap()).unwrap()];
+                // Process following args in array
+                let mut array_end = false;
+                while !array_end {
+                    if let Some(value) = input.next() {
+                        // Last arg in array
+                        if value.ends_with(']') {
+                            array_arg.push(
+                                Felt252::from_dec_str(value.strip_suffix(']').unwrap()).unwrap(),
+                            );
+                            array_end = true;
+                        } else {
+                            array_arg.push(Felt252::from_dec_str(value).unwrap())
+                        }
                     }
                 }
+                // Finalize array
+                args.push(FuncArg::Array(array_arg))
             }
-            // Finalize array
-            args.push(FuncArg::Array(array_arg))
         } else {
             // Single argument
             args.push(FuncArg::Single(Felt252::from_dec_str(value).unwrap()))