Fix yul ast ID to 0 instead of 1.

Changelog.md

@@ -7,6 +7,7 @@ Compiler Features:
 
 
 Bugfixes:
+ * AST: Fix wrong initial ID for Yul nodes in the AST.
  * NatSpec: Fix internal error when requesting userdoc or devdoc for a contract that emits an event defined in a foreign contract or interface.
  * SMTChecker: Fix encoding error that causes loops to unroll after completion.
 

libsolidity/interface/StandardCompiler.cpp

@@ -1553,7 +1553,7 @@ Json::Value StandardCompiler::compileYul(InputsAndSettings _inputsAndSettings)
 	if (isArtifactRequested(_inputsAndSettings.outputSelection, sourceName, contractName, "ast", wildcardMatchesExperimental))
 	{
 		Json::Value sourceResult = Json::objectValue;
-		sourceResult["id"] = 1;
+		sourceResult["id"] = 0;
 		sourceResult["ast"] = stack.astJson();
 		output["sources"][sourceName] = sourceResult;
 	}

test/cmdlineTests/standard_yul/output.json

@@ -169,7 +169,7 @@
                 "nodeType": "YulObject",
                 "subObjects": []
             },
-            "id": 1
+            "id": 0
         }
     }
 }

test/cmdlineTests/standard_yul_object/output.json

@@ -179,7 +179,7 @@ data_4e03657aea45a94fc7d47ba826c8d667c0d1e6e33a64a036ec44f58fa12d6c45 616263
                     }
                 ]
             },
-            "id": 1
+            "id": 0
         }
     }
 }

test/cmdlineTests/standard_yul_object_name/output.json

@@ -258,7 +258,7 @@ sub_0: assembly {
                     }
                 ]
             },
-            "id": 1
+            "id": 0
         }
     }
 }

test/cmdlineTests/standard_yul_optimiserSteps/output.json

@@ -166,7 +166,7 @@
                 "nodeType": "YulObject",
                 "subObjects": []
             },
-            "id": 1
+            "id": 0
         }
     }
 }

test/cmdlineTests/standard_yul_optimized/output.json

@@ -161,7 +161,7 @@
                 "nodeType": "YulObject",
                 "subObjects": []
             },
-            "id": 1
+            "id": 0
         }
     }
 }