test(es/minifier): Add a test for a fixed issue (#6218)

**Related issue (if exists):**

 - Closes #6217.

crates/swc/tests/exec/issues-6xxx/6127/1/input/.swcrc

@@ -0,0 +1,64 @@
+{
+    "jsc": {
+        "parser": {
+            "syntax": "ecmascript",
+            "jsx": false
+        },
+        "target": "es2019",
+        "loose": false,
+        "minify": {
+            "compress": {
+                "arguments": false,
+                "arrows": false,
+                "booleans": false,
+                "booleans_as_integers": false,
+                "collapse_vars": true,
+                "comparisons": false,
+                "computed_props": false,
+                "conditionals": false,
+                "dead_code": false,
+                "directives": false,
+                "drop_console": false,
+                "drop_debugger": false,
+                "evaluate": false,
+                "expression": false,
+                "hoist_funs": false,
+                "hoist_props": false,
+                "hoist_vars": false,
+                "if_return": false,
+                "join_vars": false,
+                "keep_classnames": false,
+                "keep_fargs": false,
+                "keep_fnames": false,
+                "keep_infinity": false,
+                "loops": false,
+                "negate_iife": false,
+                "properties": false,
+                "reduce_funcs": false,
+                "reduce_vars": false,
+                "side_effects": false,
+                "switches": false,
+                "typeofs": false,
+                "unsafe": false,
+                "unsafe_arrows": false,
+                "unsafe_comps": false,
+                "unsafe_Function": false,
+                "unsafe_math": false,
+                "unsafe_symbols": false,
+                "unsafe_methods": false,
+                "unsafe_proto": false,
+                "unsafe_regexp": false,
+                "unsafe_undefined": false,
+                "unused": false,
+                "const_to_let": false,
+                "pristine_globals": false
+            },
+            "mangle": false
+        }
+    },
+    "module": {
+        "type": "es6"
+    },
+    "minify": false,
+    "isModule": true
+}

crates/swc/tests/exec/issues-6xxx/6127/1/input/exec.js

@@ -0,0 +1,13 @@
+const a = 0;
+let b;
+for (let i = 0; i < 2; ++i) {
+    if (i === 0) {
+        b = 1;
+    } else {
+        b = 2;
+    }
+    console.log(a, b);
+}
+
+let c = 1, d;
+while (c--) { }

crates/swc_ecma_minifier/tests/exec.rs

@@ -10249,3 +10249,81 @@ fn issue_6039_2() {
     "###,
     );
 }
+
+#[test]
+fn issue_6217_1() {
+    run_exec_test(
+        r###"
+        var foo = function foo() {
+            var walker = 0;
+            var arr = [];
+            function bar(defaultValue) {
+                var myIndex = walker;
+                walker += 1;
+                console.log({
+                    arr: arr
+                });
+                if (arr.length < myIndex + 1) {
+                    arr[myIndex] = defaultValue;
+                }
+            }
+            return bar;
+        };
+        var bar = foo();
+        bar(null);
+        bar(null);
+        bar(null);
+        bar(null);
+        bar(null);
+    "###,
+        r###"
+        {
+            "arguments": false,
+            "arrows": false,
+            "booleans": false,
+            "booleans_as_integers": false,
+            "collapse_vars": true,
+            "comparisons": false,
+            "computed_props": false,
+            "conditionals": false,
+            "dead_code": false,
+            "directives": false,
+            "drop_console": false,
+            "drop_debugger": false,
+            "evaluate": false,
+            "expression": false,
+            "hoist_funs": false,
+            "hoist_props": false,
+            "hoist_vars": false,
+            "if_return": false,
+            "join_vars": false,
+            "keep_classnames": false,
+            "keep_fargs": false,
+            "keep_fnames": false,
+            "keep_infinity": false,
+            "loops": false,
+            "negate_iife": false,
+            "properties": false,
+            "reduce_funcs": false,
+            "reduce_vars": false,
+            "side_effects": false,
+            "switches": false,
+            "typeofs": false,
+            "unsafe": false,
+            "unsafe_arrows": false,
+            "unsafe_comps": false,
+            "unsafe_Function": false,
+            "unsafe_math": false,
+            "unsafe_symbols": false,
+            "unsafe_methods": false,
+            "unsafe_proto": false,
+            "unsafe_regexp": false,
+            "unsafe_undefined": false,
+            "unused": false,
+            "const_to_let": false,
+            "pristine_globals": false
+        }
+        "###,
+        false,
+    );
+}

crates/swc_html_parser/tests/html5lib_tests.rs

@@ -1,3 +1,6 @@
+#![allow(clippy::redundant_clone)]
+#![allow(clippy::while_let_on_iterator)]
+
 use std::{fs, mem::take, path::PathBuf};
 
 use common::{document_span_visualizer, DomVisualizer};
@@ -666,11 +669,9 @@ fn html5lib_test_tree_construction(input: PathBuf) {
             let need_skip_fragment = relative_path_to_test.contains("template_dat")
                 && matches!(counter, 109 | 110 | 111);
 
-            if !need_skip_fragment {
-                if !document_fragment.is_empty() {
-                    file_stem += ".fragment_";
-                    file_stem += &document_fragment.join("").replace(' ', "_");
-                }
+            if !need_skip_fragment && !document_fragment.is_empty() {
+                file_stem += ".fragment_";
+                file_stem += &document_fragment.join("").replace(' ', "_");
             }
 
             if scripting_enabled {