From d6e8c6fb2f6f915b4b0c2cb5602d6de9b14437fa Mon Sep 17 00:00:00 2001
From: Boshen <boshenc@gmail.com>
Date: Sun, 12 Mar 2023 23:30:32 +0800
Subject: [PATCH] feat(parser): check `ReturnStatement` in return context

---
 crates/oxc_parser/src/js/statement.rs |   7 +-
 tasks/coverage/babel.snap             |  39 +++++++-
 tasks/coverage/test262.snap           | 139 +++++++++++++++++++++++---
 tasks/coverage/typescript.snap        |  90 +++++++++++++++--
 4 files changed, 247 insertions(+), 28 deletions(-)

diff --git a/crates/oxc_parser/src/js/statement.rs b/crates/oxc_parser/src/js/statement.rs
index 7e1e89436..8f73df45e 100644
--- a/crates/oxc_parser/src/js/statement.rs
+++ b/crates/oxc_parser/src/js/statement.rs
@@ -101,7 +101,6 @@ impl<'a> Parser<'a> {
             }
             Kind::Export => self.parse_export_declaration(),
             // [+Return] ReturnStatement[?Yield, ?Await]
-            // Error is checked in linter
             Kind::Return => self.parse_return_statement(),
             Kind::Var => self.parse_variable_statement(stmt_ctx),
             Kind::Const if !(self.ts_enabled() && self.is_at_enum_declaration()) => {
@@ -374,6 +373,12 @@ impl<'a> Parser<'a> {
             self.asi()?;
             Some(expr)
         };
+        if !self.ctx.has_return() {
+            self.error(diagnostics::ReturnStatementOnlyInFunctionBody(Span::new(
+                span.start,
+                span.start + 6,
+            )));
+        }
         Ok(self.ast.return_statement(self.end_span(span), argument))
     }
 
diff --git a/tasks/coverage/babel.snap b/tasks/coverage/babel.snap
index 0b2a1d44d..8aa1b4e10 100644
--- a/tasks/coverage/babel.snap
+++ b/tasks/coverage/babel.snap
@@ -1,7 +1,7 @@
 Babel Summary:
-AST Parsed     : 2053/2069 (99.23%)
-Positive Passed: 2053/2069 (99.23%)
-Negative Passed: 1061/1502 (70.64%)
+AST Parsed     : 2051/2069 (99.13%)
+Positive Passed: 2051/2069 (99.13%)
+Negative Passed: 1063/1502 (70.77%)
 Expect Syntax Error: "annex-b/disabled/1.1-html-comments-close/input.js"
 Expect Syntax Error: "annex-b/disabled/3.1-sloppy-labeled-functions-if-body/input.js"
 Expect Syntax Error: "annex-b/disabled/3.1-sloppy-labeled-functions-multiple-labels/input.js"
@@ -31,7 +31,6 @@ Expect Syntax Error: "core/scope/undecl-export-builtin-as/input.js"
 Expect Syntax Error: "core/scope/undecl-export-builtin/input.js"
 Expect Syntax Error: "core/scope/undecl-export-if/input.js"
 Expect Syntax Error: "core/scope/undecl-export/input.js"
-Expect Syntax Error: "core/uncategorised/454/input.js"
 Expect Syntax Error: "core/uncategorised/466/input.js"
 Expect Syntax Error: "core/uncategorised/467/input.js"
 Expect Syntax Error: "core/uncategorised/468/input.js"
@@ -245,7 +244,6 @@ Expect Syntax Error: "esprima/invalid-syntax/migrated_0093/input.js"
 Expect Syntax Error: "esprima/invalid-syntax/migrated_0094/input.js"
 Expect Syntax Error: "esprima/invalid-syntax/migrated_0100/input.js"
 Expect Syntax Error: "esprima/invalid-syntax/migrated_0101/input.js"
-Expect Syntax Error: "esprima/invalid-syntax/migrated_0171/input.js"
 Expect Syntax Error: "esprima/invalid-syntax/migrated_0183/input.js"
 Expect Syntax Error: "esprima/invalid-syntax/migrated_0184/input.js"
 Expect Syntax Error: "esprima/invalid-syntax/migrated_0185/input.js"
@@ -465,6 +463,23 @@ Expect to Parse: "core/scope/dupl-bind-gen-gen-script/input.js"
    ·           ─┬─
    ·            ╰── It can not be redeclared here
    ╰────
+Expect to Parse: "core/uncategorised/327/input.js"
+
+  × TS1108: A 'return' statement can only be used within a function body
+   ╭─[core/uncategorised/327/input.js:1:1]
+ 1 │ return {} / 2
+   · ───┬──
+   ·    ╰── A 'return' statement can only be used within a function body.
+   ╰────
+Expect to Parse: "core/uncategorised/328/input.js"
+
+  × TS1108: A 'return' statement can only be used within a function body
+   ╭─[core/uncategorised/328/input.js:1:1]
+ 1 │ return
+   · ───┬──
+   ·    ╰── A 'return' statement can only be used within a function body.
+ 2 │ {}
+   ╰────
 Expect to Parse: "typescript/arrow-function/generic-tsx-babel-7/input.ts"
 
   × Expect token
@@ -1868,6 +1883,13 @@ Expect to Parse: "typescript/types/const-type-parameters/input.ts"
    ·  ╰── Unterminated string
    ╰────
 
+  × TS1108: A 'return' statement can only be used within a function body
+   ╭─[core/uncategorised/454/input.js:1:1]
+ 1 │ return
+   · ───┬──
+   ·    ╰── A 'return' statement can only be used within a function body.
+   ╰────
+
   × Illegal break statement
    ╭─[core/uncategorised/455/input.js:1:1]
  1 │ break
@@ -7861,6 +7883,13 @@ Expect to Parse: "typescript/types/const-type-parameters/input.ts"
    ·               ─
    ╰────
 
+  × TS1108: A 'return' statement can only be used within a function body
+   ╭─[esprima/invalid-syntax/migrated_0171/input.js:1:1]
+ 1 │ return
+   · ───┬──
+   ·    ╰── A 'return' statement can only be used within a function body.
+   ╰────
+
   × Illegal break statement
    ╭─[esprima/invalid-syntax/migrated_0172/input.js:1:1]
  1 │ break
diff --git a/tasks/coverage/test262.snap b/tasks/coverage/test262.snap
index 9cd26ee84..3489d0f31 100644
--- a/tasks/coverage/test262.snap
+++ b/tasks/coverage/test262.snap
@@ -1,7 +1,7 @@
 Test262 Summary:
 AST Parsed     : 44015/44034 (99.96%)
 Positive Passed: 44015/44034 (99.96%)
-Negative Passed: 3302/3917 (84.30%)
+Negative Passed: 3315/3917 (84.63%)
 Expect Syntax Error: "language/block-scope/syntax/function-declarations/in-statement-position-do-statement-while-expression.js"
 Expect Syntax Error: "language/block-scope/syntax/function-declarations/in-statement-position-for-statement.js"
 Expect Syntax Error: "language/block-scope/syntax/function-declarations/in-statement-position-if-expression-statement-else-statement.js"
@@ -302,7 +302,6 @@ Expect Syntax Error: "language/global-code/export.js"
 Expect Syntax Error: "language/global-code/import.js"
 Expect Syntax Error: "language/global-code/new.target-arrow.js"
 Expect Syntax Error: "language/global-code/new.target.js"
-Expect Syntax Error: "language/global-code/return.js"
 Expect Syntax Error: "language/import/dup-bound-names.js"
 Expect Syntax Error: "language/import/json-invalid.js"
 Expect Syntax Error: "language/import/json-named-bindings.js"
@@ -323,7 +322,6 @@ Expect Syntax Error: "language/module-code/early-dup-export-star-as-dflt.js"
 Expect Syntax Error: "language/module-code/early-export-global.js"
 Expect Syntax Error: "language/module-code/early-export-unresolvable.js"
 Expect Syntax Error: "language/module-code/early-new-target.js"
-Expect Syntax Error: "language/module-code/parse-err-return.js"
 Expect Syntax Error: "language/module-code/top-level-await/syntax/early-does-not-propagate-to-fn-declaration-body.js"
 Expect Syntax Error: "language/module-code/top-level-await/syntax/early-does-not-propagate-to-fn-declaration-params.js"
 Expect Syntax Error: "language/module-code/top-level-await/syntax/early-does-not-propagate-to-fn-expr-body.js"
@@ -464,7 +462,6 @@ Expect Syntax Error: "language/statements/class/method/object-destructuring-para
 Expect Syntax Error: "language/statements/class/method/rest-param-strict-body.js"
 Expect Syntax Error: "language/statements/class/static-gen-method-param-dflt-yield.js"
 Expect Syntax Error: "language/statements/class/static-init-invalid-await.js"
-Expect Syntax Error: "language/statements/class/static-init-invalid-return.js"
 Expect Syntax Error: "language/statements/const/dstr/ary-ptrn-rest-init-ary.js"
 Expect Syntax Error: "language/statements/const/dstr/ary-ptrn-rest-init-id.js"
 Expect Syntax Error: "language/statements/const/dstr/ary-ptrn-rest-init-obj.js"
@@ -594,16 +591,6 @@ Expect Syntax Error: "language/statements/labeled/decl-fun-strict.js"
 Expect Syntax Error: "language/statements/let/dstr/ary-ptrn-rest-init-ary.js"
 Expect Syntax Error: "language/statements/let/dstr/ary-ptrn-rest-init-id.js"
 Expect Syntax Error: "language/statements/let/dstr/ary-ptrn-rest-init-obj.js"
-Expect Syntax Error: "language/statements/return/S12.9_A1_T1.js"
-Expect Syntax Error: "language/statements/return/S12.9_A1_T10.js"
-Expect Syntax Error: "language/statements/return/S12.9_A1_T2.js"
-Expect Syntax Error: "language/statements/return/S12.9_A1_T3.js"
-Expect Syntax Error: "language/statements/return/S12.9_A1_T4.js"
-Expect Syntax Error: "language/statements/return/S12.9_A1_T5.js"
-Expect Syntax Error: "language/statements/return/S12.9_A1_T6.js"
-Expect Syntax Error: "language/statements/return/S12.9_A1_T7.js"
-Expect Syntax Error: "language/statements/return/S12.9_A1_T8.js"
-Expect Syntax Error: "language/statements/return/S12.9_A1_T9.js"
 Expect Syntax Error: "language/statements/try/dstr/ary-ptrn-rest-init-ary.js"
 Expect Syntax Error: "language/statements/try/dstr/ary-ptrn-rest-init-id.js"
 Expect Syntax Error: "language/statements/try/dstr/ary-ptrn-rest-init-obj.js"
@@ -16157,6 +16144,14 @@ Expect to Parse: "language/statements/function/S14_A5_T2.js"
     ·      ──
     ╰────
 
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/global-code/return.js:21:1]
+ 21 │ 
+ 22 │ return;
+    · ───┬──
+    ·    ╰── A 'return' statement can only be used within a function body.
+    ╰────
+
   × Super calls are not permitted outside constructors or in nested functions inside constructors.
   │ 
     ╭─[language/global-code/super-call-arrow.js:35:1]
@@ -19484,6 +19479,14 @@ Expect to Parse: "language/statements/function/S14_A5_T2.js"
     ·                                ╰── Expected an expression here
     ╰────
 
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/module-code/parse-err-return.js:31:1]
+ 31 │ 
+ 32 │ return;
+    · ───┬──
+    ·    ╰── A 'return' statement can only be used within a function body.
+    ╰────
+
   × Automatic Semicolon Insertion
     ╭─[language/module-code/parse-err-semi-dflt-expr.js:26:1]
  26 │ 
@@ -26338,6 +26341,15 @@ Expect to Parse: "language/statements/function/S14_A5_T2.js"
  24 │   }
     ╰────
 
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/statements/class/static-init-invalid-return.js:23:1]
+ 23 │     static {
+ 24 │       return;
+    ·       ───┬──
+    ·          ╰── A 'return' statement can only be used within a function body.
+ 25 │     }
+    ╰────
+
   × Super calls are not permitted outside constructors or in nested functions inside constructors.
   │ 
     ╭─[language/statements/class/static-init-invalid-super-call.js:19:1]
@@ -29867,6 +29879,105 @@ Expect to Parse: "language/statements/function/S14_A5_T2.js"
     ╰────
   help: Try insert a semicolon here
 
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/statements/return/S12.9_A1_T1.js:17:1]
+ 17 │ var x=1;
+ 18 │ return;
+    · ───┬──
+    ·    ╰── A 'return' statement can only be used within a function body.
+ 19 │ var y=2;
+    ╰────
+
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/statements/return/S12.9_A1_T10.js:16:1]
+ 16 │ //CHECK#1
+ 17 │ return (0);
+    · ───┬──
+    ·    ╰── A 'return' statement can only be used within a function body.
+ 18 │ //
+    ╰────
+
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/statements/return/S12.9_A1_T2.js:17:1]
+ 17 │ var x=1;
+ 18 │ return x;
+    · ───┬──
+    ·    ╰── A 'return' statement can only be used within a function body.
+ 19 │ var y=2;
+    ╰────
+
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/statements/return/S12.9_A1_T3.js:17:1]
+ 17 │ try {
+ 18 │     return 1;
+    ·     ───┬──
+    ·        ╰── A 'return' statement can only be used within a function body.
+ 19 │ } catch(e){
+    ╰────
+
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/statements/return/S12.9_A1_T3.js:19:1]
+ 19 │ } catch(e){
+ 20 │     return 1;
+    ·     ───┬──
+    ·        ╰── A 'return' statement can only be used within a function body.
+ 21 │ }
+    ╰────
+
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/statements/return/S12.9_A1_T4.js:16:1]
+ 16 │ //CHECK#1
+ 17 │ return;
+    · ───┬──
+    ·    ╰── A 'return' statement can only be used within a function body.
+ 18 │ //
+    ╰────
+
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/statements/return/S12.9_A1_T5.js:20:1]
+ 20 │     var x=1;
+ 21 │     return;
+    ·     ───┬──
+    ·        ╰── A 'return' statement can only be used within a function body.
+ 22 │     var y=2;
+    ╰────
+
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/statements/return/S12.9_A1_T6.js:20:1]
+ 20 │     var x=1;
+ 21 │     return;
+    ·     ───┬──
+    ·        ╰── A 'return' statement can only be used within a function body.
+ 22 │     var y=2;
+    ╰────
+
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/statements/return/S12.9_A1_T7.js:20:1]
+ 20 │     var x=1;
+ 21 │     return x;
+    ·     ───┬──
+    ·        ╰── A 'return' statement can only be used within a function body.
+ 22 │     var y=2;
+    ╰────
+
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/statements/return/S12.9_A1_T8.js:20:1]
+ 20 │     var x=1;
+ 21 │     return x;
+    ·     ───┬──
+    ·        ╰── A 'return' statement can only be used within a function body.
+ 22 │     var y=2;
+    ╰────
+
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[language/statements/return/S12.9_A1_T9.js:19:1]
+ 19 │ } catch(e){
+ 20 │     return e;
+    ·     ───┬──
+    ·        ╰── A 'return' statement can only be used within a function body.
+ 21 │ }
+    ╰────
+
   × Identifier `default` has already been declared
     ╭─[language/statements/switch/S12.11_A2_T1.js:20:1]
  20 │           result += 2;
diff --git a/tasks/coverage/typescript.snap b/tasks/coverage/typescript.snap
index e3328898c..f1c2e00d4 100644
--- a/tasks/coverage/typescript.snap
+++ b/tasks/coverage/typescript.snap
@@ -1,7 +1,7 @@
 TypeScript Summary:
 AST Parsed     : 2305/2338 (98.59%)
 Positive Passed: 2305/2338 (98.59%)
-Negative Passed: 637/2532 (25.16%)
+Negative Passed: 644/2532 (25.43%)
 Expect Syntax Error: "Symbols/ES5SymbolProperty2.ts"
 Expect Syntax Error: "Symbols/ES5SymbolProperty6.ts"
 Expect Syntax Error: "additionalChecks/noPropertyAccessFromIndexSignature1.ts"
@@ -94,7 +94,6 @@ Expect Syntax Error: "classes/classStaticBlock/classStaticBlock19.ts"
 Expect Syntax Error: "classes/classStaticBlock/classStaticBlock23.ts"
 Expect Syntax Error: "classes/classStaticBlock/classStaticBlock3.ts"
 Expect Syntax Error: "classes/classStaticBlock/classStaticBlock4.ts"
-Expect Syntax Error: "classes/classStaticBlock/classStaticBlock7.ts"
 Expect Syntax Error: "classes/classStaticBlock/classStaticBlock9.ts"
 Expect Syntax Error: "classes/classStaticBlock/classStaticBlockUseBeforeDef2.ts"
 Expect Syntax Error: "classes/classStaticBlock/classStaticBlockUseBeforeDef3.ts"
@@ -1164,7 +1163,6 @@ Expect Syntax Error: "parser/ecmascript5/ErrorRecovery/ParameterLists/parserErro
 Expect Syntax Error: "parser/ecmascript5/ErrorRecovery/parserCommaInTypeMemberList2.ts"
 Expect Syntax Error: "parser/ecmascript5/ErrorRecovery/parserModifierOnPropertySignature1.ts"
 Expect Syntax Error: "parser/ecmascript5/ErrorRecovery/parserModifierOnStatementInBlock2.ts"
-Expect Syntax Error: "parser/ecmascript5/ErrorRecovery/parserStatementIsNotAMemberVariableDeclaration1.ts"
 Expect Syntax Error: "parser/ecmascript5/ExportAssignments/parserExportAssignment1.ts"
 Expect Syntax Error: "parser/ecmascript5/ExportAssignments/parserExportAssignment2.ts"
 Expect Syntax Error: "parser/ecmascript5/ExportAssignments/parserExportAssignment5.ts"
@@ -1271,7 +1269,6 @@ Expect Syntax Error: "parser/ecmascript5/RegressionTests/parser553699.ts"
 Expect Syntax Error: "parser/ecmascript5/RegressionTests/parser618973.ts"
 Expect Syntax Error: "parser/ecmascript5/RegressionTests/parserTernaryAndCommaOperators1.ts"
 Expect Syntax Error: "parser/ecmascript5/RegularExpressions/parseRegularExpressionMixedWithComments.ts"
-Expect Syntax Error: "parser/ecmascript5/RegularExpressions/parserRegularExpression1.ts"
 Expect Syntax Error: "parser/ecmascript5/RegularExpressions/parserRegularExpression2.ts"
 Expect Syntax Error: "parser/ecmascript5/RegularExpressions/parserRegularExpression3.ts"
 Expect Syntax Error: "parser/ecmascript5/RegularExpressions/parserRegularExpression4.ts"
@@ -1282,8 +1279,6 @@ Expect Syntax Error: "parser/ecmascript5/RegularExpressions/parserRegularExpress
 Expect Syntax Error: "parser/ecmascript5/Statements/BreakStatements/parser_breakInIterationOrSwitchStatement4.ts"
 Expect Syntax Error: "parser/ecmascript5/Statements/ContinueStatements/parser_continueInIterationStatement4.ts"
 Expect Syntax Error: "parser/ecmascript5/Statements/ContinueStatements/parser_continueNotInIterationStatement4.ts"
-Expect Syntax Error: "parser/ecmascript5/Statements/ReturnStatements/parserReturnStatement1.ts"
-Expect Syntax Error: "parser/ecmascript5/Statements/ReturnStatements/parserReturnStatement2.ts"
 Expect Syntax Error: "parser/ecmascript5/Statements/parserBlockStatement1.d.ts"
 Expect Syntax Error: "parser/ecmascript5/Statements/parserDebuggerStatement1.d.ts"
 Expect Syntax Error: "parser/ecmascript5/Statements/parserDoStatement1.d.ts"
@@ -1311,7 +1306,6 @@ Expect Syntax Error: "parser/ecmascript5/Statements/parserForStatement5.ts"
 Expect Syntax Error: "parser/ecmascript5/Statements/parserIfStatement1.d.ts"
 Expect Syntax Error: "parser/ecmascript5/Statements/parserIfStatement2.ts"
 Expect Syntax Error: "parser/ecmascript5/Statements/parserLabeledStatement1.d.ts"
-Expect Syntax Error: "parser/ecmascript5/Statements/parserReturnStatement1.d.ts"
 Expect Syntax Error: "parser/ecmascript5/Statements/parserSwitchStatement1.d.ts"
 Expect Syntax Error: "parser/ecmascript5/Statements/parserThrowStatement1.d.ts"
 Expect Syntax Error: "parser/ecmascript5/Statements/parserTryStatement1.d.ts"
@@ -1367,7 +1361,6 @@ Expect Syntax Error: "parser/ecmascript5/parserArgumentList1.ts"
 Expect Syntax Error: "parser/ecmascript5/parserAstSpans1.ts"
 Expect Syntax Error: "parser/ecmascript5/parserImportDeclaration1.ts"
 Expect Syntax Error: "parser/ecmascript5/parserNoASIOnCallAfterFunctionExpression1.ts"
-Expect Syntax Error: "parser/ecmascript5/parserNotRegex1.ts"
 Expect Syntax Error: "parser/ecmascript5/parserObjectCreationArrayLiteral2.ts"
 Expect Syntax Error: "parser/ecmascript5/parserObjectCreationArrayLiteral4.ts"
 Expect Syntax Error: "parser/ecmascript5/parserRealSource1.ts"
@@ -2829,6 +2822,24 @@ Expect to Parse: "salsa/privateIdentifierExpando.ts"
  14 │ 
     ╰────
 
+  × TS1108: A 'return' statement can only be used within a function body
+   ╭─[classes/classStaticBlock/classStaticBlock7.ts:4:1]
+ 4 │         yield 1;
+ 5 │         return 1;
+   ·         ───┬──
+   ·            ╰── A 'return' statement can only be used within a function body.
+ 6 │     }
+   ╰────
+
+  × TS1108: A 'return' statement can only be used within a function body
+    ╭─[classes/classStaticBlock/classStaticBlock7.ts:35:1]
+ 35 │         static {
+ 36 │             return 1;
+    ·             ───┬──
+    ·                ╰── A 'return' statement can only be used within a function body.
+ 37 │ 
+    ╰────
+
   × Jump target cannot cross function boundary.
    ╭─[classes/classStaticBlock/classStaticBlock8.ts:5:1]
  5 │                 if (v === 1) {
@@ -8745,6 +8756,14 @@ Expect to Parse: "salsa/privateIdentifierExpando.ts"
    ·                             ─
    ╰────
 
+  × TS1108: A 'return' statement can only be used within a function body
+   ╭─[parser/ecmascript5/ErrorRecovery/ModuleElements/parserErrorRecovery_ModuleElement1.ts:1:1]
+ 1 │ return foo;
+   · ───┬──
+   ·    ╰── A 'return' statement can only be used within a function body.
+ 2 │ }
+   ╰────
+
   × Unexpected token
    ╭─[parser/ecmascript5/ErrorRecovery/ModuleElements/parserErrorRecovery_ModuleElement1.ts:1:1]
  1 │ return foo;
@@ -8988,6 +9007,14 @@ Expect to Parse: "salsa/privateIdentifierExpando.ts"
    ╰────
   help: Try insert a semicolon here
 
+  × TS1108: A 'return' statement can only be used within a function body
+   ╭─[parser/ecmascript5/ErrorRecovery/parserStatementIsNotAMemberVariableDeclaration1.ts:1:1]
+ 1 │ return {
+   · ───┬──
+   ·    ╰── A 'return' statement can only be used within a function body.
+ 2 │ 
+   ╰────
+
   × Automatic Semicolon Insertion
    ╭─[parser/ecmascript5/ErrorRecovery/parserUnfinishedTypeNameBeforeKeyword1.ts:1:1]
  1 │ var x: TypeModule1.
@@ -9554,6 +9581,13 @@ Expect to Parse: "salsa/privateIdentifierExpando.ts"
    ╰────
   help: Try insert a semicolon here
 
+  × TS1108: A 'return' statement can only be used within a function body
+   ╭─[parser/ecmascript5/RegularExpressions/parserRegularExpression1.ts:1:1]
+ 1 │ return /(#?-?\d*\.\d\w*%?)|(@?#?[\w-?]+%?)/g;
+   · ───┬──
+   ·    ╰── A 'return' statement can only be used within a function body.
+   ╰────
+
   × Unexpected flag a in regular expression literal
    ╭─[parser/ecmascript5/RegularExpressions/parserRegularExpressionDivideAmbiguity3.ts:1:1]
  1 │ if (1) /regexp/a.foo();
@@ -9926,6 +9960,22 @@ Expect to Parse: "salsa/privateIdentifierExpando.ts"
  4 │   while (true) {
    ╰────
 
+  × TS1108: A 'return' statement can only be used within a function body
+   ╭─[parser/ecmascript5/Statements/ReturnStatements/parserReturnStatement1.ts:1:1]
+ 1 │ return;
+   · ───┬──
+   ·    ╰── A 'return' statement can only be used within a function body.
+   ╰────
+
+  × TS1108: A 'return' statement can only be used within a function body
+   ╭─[parser/ecmascript5/Statements/ReturnStatements/parserReturnStatement2.ts:1:1]
+ 1 │ {
+ 2 │    return;
+   ·    ───┬──
+   ·       ╰── A 'return' statement can only be used within a function body.
+ 3 │ }
+   ╰────
+
   × Illegal break statement
    ╭─[parser/ecmascript5/Statements/parserBreakStatement1.d.ts:1:1]
  1 │ break;
@@ -10044,6 +10094,13 @@ Expect to Parse: "salsa/privateIdentifierExpando.ts"
  2 │ }
    ╰────
 
+  × TS1108: A 'return' statement can only be used within a function body
+   ╭─[parser/ecmascript5/Statements/parserReturnStatement1.d.ts:1:1]
+ 1 │ return;
+   · ───┬──
+   ·    ╰── A 'return' statement can only be used within a function body.
+   ╰────
+
   × 'with' statements are not allowed
    ╭─[parser/ecmascript5/Statements/parserWithStatement1.d.ts:1:1]
  1 │ with (foo) {
@@ -10058,6 +10115,14 @@ Expect to Parse: "salsa/privateIdentifierExpando.ts"
  2 │   return;
    ╰────
 
+  × TS1108: A 'return' statement can only be used within a function body
+   ╭─[parser/ecmascript5/Statements/parserWithStatement2.ts:1:1]
+ 1 │ with (1)
+ 2 │   return;
+   ·   ───┬──
+   ·      ╰── A 'return' statement can only be used within a function body.
+   ╰────
+
   × 'with' statements are not allowed
    ╭─[parser/ecmascript5/StrictMode/parserStrictMode14.ts:1:1]
  1 │ "use strict";
@@ -10142,6 +10207,15 @@ Expect to Parse: "salsa/privateIdentifierExpando.ts"
    ·           ╰── Unterminated multiline comment
    ╰────
 
+  × TS1108: A 'return' statement can only be used within a function body
+   ╭─[parser/ecmascript5/parserNotRegex1.ts:2:1]
+ 2 │   {
+ 3 │     return true;
+   ·     ───┬──
+   ·        ╰── A 'return' statement can only be used within a function body.
+ 4 │   }
+   ╰────
+
   × Unexpected token
    ╭─[parser/ecmascript5/parserObjectCreationArrayLiteral1.ts:1:1]
  1 │ new Foo[];