Fix Display of Value::LastError with lambda

There was a small typo in the `fn display_last_error`.

Closes #263

Cargo.lock

@@ -127,6 +127,7 @@ dependencies = [
  "lalrpop",
  "lalrpop-util",
  "multimap",
+ "non-empty-vec",
  "regex",
  "serde",
  "serde_json",

crates/air-lib/air-parser/Cargo.toml

@@ -33,6 +33,7 @@ thiserror = "1.0.23"
 [dev-dependencies]
 fstrings = "0.2.3"
 criterion = "0.3.3"
+non-empty-vec = { version = "0.2.0" }
 
 [[bench]]
 name = "parser"

crates/air-lib/air-parser/src/ast/instruction_arguments/traits.rs

@@ -152,7 +152,7 @@ fn display_last_error(
     last_error_accessor: &Option<LambdaAST>,
 ) -> fmt::Result {
     match last_error_accessor {
-        Some(accessor) => write!(f, "%last_error%.$.{}", air_lambda_ast::format_ast(accessor)),
+        Some(accessor) => write!(f, "%last_error%.${}", air_lambda_ast::format_ast(accessor)),
         None => write!(f, "%last_error%"),
     }
 }

crates/air-lib/air-parser/src/ast/mod.rs

@@ -18,6 +18,9 @@ mod instruction_arguments;
 mod instructions;
 mod values;
 
+#[cfg(test)]
+pub mod tests;
+
 pub use instruction_arguments::*;
 pub use instructions::*;
 pub use values::*;

crates/air-lib/air-parser/src/ast/tests/instruction_arguments.rs

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2022 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+use crate::ast::Value;
+use air_lambda_ast::ValueAccessor;
+use non_empty_vec::NonEmpty;
+
+#[test]
+// https://github.com/fluencelabs/aquavm/issues/263
+fn issue_263() {
+    let val = Value::LastError(Some(NonEmpty::new(ValueAccessor::FieldAccessByName {
+        field_name: "message",
+    })));
+    assert_eq!(val.to_string(), "%last_error%.$.message");
+}

crates/air-lib/air-parser/src/ast/tests/mod.rs

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2022 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+pub mod instruction_arguments;