prettier-solidity · Janther · Feb 27, 2026 · Feb 23, 2026 · Feb 25, 2026 · Feb 26, 2026
diff --git a/.c8rc b/.c8rc
@@ -1,9 +1,9 @@
 {
   "check-coverage": true,
-  "branches": 90,
-  "lines": 90,
-  "functions": 90,
-  "statements": 90,
+  "branches": 95,
+  "lines": 98,
+  "functions": 100,
+  "statements": 98,
   "exclude": ["/node_modules/"],
   "include": ["src/**/*.ts", "variant-coverage/**/*.ts"],
   "reporter": ["lcov", "text"],

diff --git a/tests/config/run-format-test.js b/tests/config/run-format-test.js
@@ -33,7 +33,13 @@ const unstableTests = new Map(
 
 // Here we add files that will not have the same AST after being formatted.
 const unstableAstTests = new Map(
-  [].map((fixture) => {
+  [
+    // `: =` and `= :` are syntactically the same as `:=` and `=:`, but the ast
+    // changes from `YulColonAndEqual` and `YulEqualAndColon` to `ColonEqual`
+    // and `EqualColon`, which is expected but the workaround to keep the test
+    // stable is too much, so we just put it in this list.
+    "AssemblyV0.4.26/Assembly.sol",
+  ].map((fixture) => {
     const [file, isAstUnstable = () => true] = Array.isArray(fixture)
       ? fixture
       : [fixture];
@@ -73,6 +79,12 @@ const antlrMismatchTests = new Map(
     "IndexOf/IndexOf.sol",
     // Syntax for `pragma solidity 0.5.0 - 0.6.0;` not supported by ANTLR
     "Pragma/Pragma.sol",
+    // ANTLR doesn't support assembly assignment operators separated by a space
+    // like `: =` or `= :`
+    "AssemblyV0.4.26/Assembly.sol",
+    // ANTLR doesn't support UntypedTupleMember with a storage location, which
+    // is valid Slang, but not in Solidity.
+    "AllSolidityFeaturesV0.4.26/AllSolidityFeatures.sol",
   ].map((fixture) => {
     const [file, compareBytecode = () => true] = Array.isArray(fixture)
       ? fixture

diff --git a/tests/format/AllSolidityFeatures/AllSolidityFeatures.sol b/tests/format/AllSolidityFeatures/AllSolidityFeatures.sol
@@ -181,6 +181,7 @@ contract assemblyLocalBinding {
       let x := 0x00
       let y := x
       let z := "hello"
+      let t := hex"0123456789abcdef"
     }
   }
 }

diff --git a/tests/format/AllSolidityFeatures/__snapshots__/format.test.js.snap b/tests/format/AllSolidityFeatures/__snapshots__/format.test.js.snap
@@ -189,6 +189,7 @@ contract assemblyLocalBinding {
       let x := 0x00
       let y := x
       let z := "hello"
+      let t := hex"0123456789abcdef"
     }
   }
 }
@@ -545,6 +546,7 @@ contract assemblyLocalBinding {
             let x := 0x00
             let y := x
             let z := "hello"
+            let t := hex"0123456789abcdef"
         }
     }
 }

diff --git a/tests/format/AllSolidityFeaturesV0.4.26/AllSolidityFeatures.sol b/tests/format/AllSolidityFeaturesV0.4.26/AllSolidityFeatures.sol
@@ -18,6 +18,20 @@ contract test {
     var b = 7 + (c * (8 - 7)) - x;
     return -(-b | 0);
   }
+
+  function singleHexString() payable {
+    string storage a = hex"ab1248fe";
+  }
+
+
+  function storageLocationsInTuple()  {
+      var (
+        memory foo,
+        storage bar,
+        baz) =
+      (0, 0, 0);
+      //   ~~~~~~      ~~~~~~~   => these are the storage locations
+  }
 }
 
 contract c {

diff --git a/tests/format/AllSolidityFeaturesV0.4.26/__snapshots__/format.test.js.snap b/tests/format/AllSolidityFeaturesV0.4.26/__snapshots__/format.test.js.snap
@@ -27,6 +27,20 @@ contract test {
     var b = 7 + (c * (8 - 7)) - x;
     return -(-b | 0);
   }
+
+  function singleHexString() payable {
+    string storage a = hex"ab1248fe";
+  }
+
+
+  function storageLocationsInTuple()  {
+      var (
+        memory foo,
+        storage bar,
+        baz) =
+      (0, 0, 0);
+      //   ~~~~~~      ~~~~~~~   => these are the storage locations
+  }
 }
 
 contract c {
@@ -225,6 +239,15 @@ contract test {
         var b = 7 + (c * (8 - 7)) - x;
         return -(-b | 0);
     }
+
+    function singleHexString() payable {
+        string storage a = hex"ab1248fe";
+    }
+
+    function storageLocationsInTuple() {
+        var (memory foo, storage bar, baz) = (0, 0, 0);
+        //   ~~~~~~      ~~~~~~~   => these are the storage locations
+    }
 }
 
 contract c {

diff --git a/tests/format/Assembly/Assembly.sol b/tests/format/Assembly/Assembly.sol
@@ -1,6 +1,9 @@
 contract Assembly {
   function ifAssembly() {
     assembly {
+      {
+          success := 1
+      }
       if
         returndatasize    {
           success := 0
@@ -51,6 +54,7 @@ for { let i := 0 } lt(i, x) { i := add(i, 1) } { y := mul(2, y) }
       -> result {
           result := add(x,
                         1)
+                        leave
 			}
   		}
   }
@@ -61,6 +65,7 @@ for { let i := 0 } lt(i, x) { i := add(i, 1) } { y := mul(2, y) }
       -> result {
           result := add(a,
                         add(b, c))
+                        leave
 			}
   		}
   }
@@ -70,6 +75,7 @@ for { let i := 0 } lt(i, x) { i := add(i, 1) } { y := mul(2, y) }
 			function sum  (thisIs, aFunctionWithVery, veryLongParameterNames, andItAlsoHasALotOfParameters, soItShouldBeSplitInMultipleLines)
       -> result {
         result := 0
+                        leave
 			}
   		}
   }
@@ -83,6 +89,7 @@ for { let i := 0 } lt(i, x) { i := add(i, 1) } { y := mul(2, y) }
         veryLongParameterNames := 0
         andItAlsoHasALotOfParameters := 0
         soItShouldBeSplitInMultipleLines := 0
+                        leave
 			}
   		}
   }

diff --git a/tests/format/Assembly/__snapshots__/format.test.js.snap b/tests/format/Assembly/__snapshots__/format.test.js.snap
@@ -9,6 +9,9 @@ printWidth: 80
 contract Assembly {
   function ifAssembly() {
     assembly {
+      {
+          success := 1
+      }
       if
         returndatasize    {
           success := 0
@@ -59,6 +62,7 @@ for { let i := 0 } lt(i, x) { i := add(i, 1) } { y := mul(2, y) }
       -> result {
           result := add(x,
                         1)
+                        leave
 			}
   		}
   }
@@ -69,6 +73,7 @@ for { let i := 0 } lt(i, x) { i := add(i, 1) } { y := mul(2, y) }
       -> result {
           result := add(a,
                         add(b, c))
+                        leave
 			}
   		}
   }
@@ -78,6 +83,7 @@ for { let i := 0 } lt(i, x) { i := add(i, 1) } { y := mul(2, y) }
 			function sum  (thisIs, aFunctionWithVery, veryLongParameterNames, andItAlsoHasALotOfParameters, soItShouldBeSplitInMultipleLines)
       -> result {
         result := 0
+                        leave
 			}
   		}
   }
@@ -91,6 +97,7 @@ for { let i := 0 } lt(i, x) { i := add(i, 1) } { y := mul(2, y) }
         veryLongParameterNames := 0
         andItAlsoHasALotOfParameters := 0
         soItShouldBeSplitInMultipleLines := 0
+                        leave
 			}
   		}
   }
@@ -191,6 +198,9 @@ contract BooleanLiteralsInAssembly {
 contract Assembly {
     function ifAssembly() {
         assembly {
+            {
+                success := 1
+            }
             if returndatasize {
                 success := 0
             }
@@ -249,6 +259,7 @@ contract Assembly {
         assembly {
             function inc(x) -> result {
                 result := add(x, 1)
+                leave
             }
         }
     }
@@ -257,6 +268,7 @@ contract Assembly {
         assembly {
             function sum(a, b, c) -> result {
                 result := add(a, add(b, c))
+                leave
             }
         }
     }
@@ -271,6 +283,7 @@ contract Assembly {
                 soItShouldBeSplitInMultipleLines
             ) -> result {
                 result := 0
+                leave
             }
         }
     }
@@ -290,6 +303,7 @@ contract Assembly {
                 veryLongParameterNames := 0
                 andItAlsoHasALotOfParameters := 0
                 soItShouldBeSplitInMultipleLines := 0
+                leave
             }
         }
     }

diff --git a/tests/format/AssemblyV0.4.26/Assembly.sol b/tests/format/AssemblyV0.4.26/Assembly.sol
@@ -39,6 +39,7 @@ contract MultipleAssemblyAssignment {
     function foo() public pure {
         assembly {
             function bar() -> a, b {
+                b :  = 2
                 a := 1
                 b := 2
             }
@@ -52,6 +53,7 @@ contract AssemblyStackAssignment {
   function f() public {
     assembly {
       4 =: y
+      4 =  : y
     }
   }
 }
diff --git a/tests/format/AssemblyV0.4.26/__snapshots__/format.test.js.snap b/tests/format/AssemblyV0.4.26/__snapshots__/format.test.js.snap
@@ -47,6 +47,7 @@ contract MultipleAssemblyAssignment {
     function foo() public pure {
         assembly {
             function bar() -> a, b {
+                b :  = 2
                 a := 1
                 b := 2
             }
@@ -60,6 +61,7 @@ contract AssemblyStackAssignment {
   function f() public {
     assembly {
       4 =: y
+      4 =  : y
     }
   }
 }
@@ -108,6 +110,7 @@ contract MultipleAssemblyAssignment {
     function foo() public pure {
         assembly {
             function bar() -> a, b {
+                b := 2
                 a := 1
                 b := 2
             }
@@ -122,6 +125,8 @@ contract AssemblyStackAssignment {
         assembly {
             4
             =: y
+            4
+            =: y
         }
     }
 }

diff --git a/tests/format/BinaryOperationHierarchy/Group.sol b/tests/format/BinaryOperationHierarchy/Group.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity 0.8.28;
+pragma solidity "0.8.28";
 
 contract Group {
     uint256 veryVeryVeryLongUint256A;

diff --git a/tests/format/BinaryOperationHierarchy/__snapshots__/format.test.js.snap b/tests/format/BinaryOperationHierarchy/__snapshots__/format.test.js.snap
@@ -7,7 +7,7 @@ printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
 // SPDX-License-Identifier: MIT
-pragma solidity 0.8.28;
+pragma solidity "0.8.28";
 
 contract Group {
     uint256 veryVeryVeryLongUint256A;
@@ -361,7 +361,7 @@ contract Group {
 }
 =====================================output=====================================
 // SPDX-License-Identifier: MIT
-pragma solidity 0.8.28;
+pragma solidity "0.8.28";
 
 contract Group {
     uint256 veryVeryVeryLongUint256A;

diff --git a/tests/format/ForStatements/ForStatements.sol b/tests/format/ForStatements/ForStatements.sol
@@ -4,6 +4,8 @@ contract ForStatements {
     function hi() public {
         uint a;
 
+for ((uint i, uint j) = getIndexes(); i < 100; i++) a++;
+
         for (uint i; i < 100; i++) a++;
 
         for (i = 0; i < 100; i++) a = a.add(LONG_VARIABLE).add(LONG_VARIABLE).add(LONG_VARIABLE);

diff --git a/tests/format/ForStatements/__snapshots__/format.test.js.snap b/tests/format/ForStatements/__snapshots__/format.test.js.snap
@@ -12,6 +12,8 @@ contract ForStatements {
     function hi() public {
         uint a;
 
+for ((uint i, uint j) = getIndexes(); i < 100; i++) a++;
+
         for (uint i; i < 100; i++) a++;
 
         for (i = 0; i < 100; i++) a = a.add(LONG_VARIABLE).add(LONG_VARIABLE).add(LONG_VARIABLE);
@@ -57,6 +59,8 @@ contract ForStatements {
     function hi() public {
         uint a;
 
+        for ((uint i, uint j) = getIndexes(); i < 100; i++) a++;
+
         for (uint i; i < 100; i++) a++;
 
         for (i = 0; i < 100; i++)

diff --git a/tests/format/FunctionDefinitions/FunctionDefinitions.sol b/tests/format/FunctionDefinitions/FunctionDefinitions.sol
@@ -45,9 +45,15 @@ contract FunctionDefinitions {
   fallback () external {}
   fallback () {}
   fallback () external payable {}
+  fallback() modify(123) override(Foo) {}
+  fallback() returns(uint) {}
+  fallback() external  modify() payable override(Foo) virtual returns(uint) {}
   fallback() external payable virtual {}
   fallback(bytes calldata _input) external {}
 
+
+  receive () modify(123) override(Foo) {}
+  receive  () external  modify() payable override(Foo) virtual {}
   receive () external payable {}
   receive() external payable virtual {}
 

diff --git a/tests/format/FunctionDefinitions/__snapshots__/format.test.js.snap b/tests/format/FunctionDefinitions/__snapshots__/format.test.js.snap
@@ -53,9 +53,15 @@ contract FunctionDefinitions {
   fallback () external {}
   fallback () {}
   fallback () external payable {}
+  fallback() modify(123) override(Foo) {}
+  fallback() returns(uint) {}
+  fallback() external  modify() payable override(Foo) virtual returns(uint) {}
   fallback() external payable virtual {}
   fallback(bytes calldata _input) external {}
 
+
+  receive () modify(123) override(Foo) {}
+  receive  () external  modify() payable override(Foo) virtual {}
   receive () external payable {}
   receive() external payable virtual {}
 
@@ -415,9 +421,14 @@ contract FunctionDefinitions {
     fallback() external {}
     fallback() {}
     fallback() external payable {}
+    fallback() override(Foo) modify(123) {}
+    fallback() returns (uint) {}
+    fallback() external payable virtual override(Foo) modify returns (uint) {}
     fallback() external payable virtual {}
     fallback(bytes calldata _input) external {}
 
+    receive() override(Foo) modify(123) {}
+    receive() external payable virtual override(Foo) modify {}
     receive() external payable {}
     receive() external payable virtual {}