Don't highlight unsafe traits as unsafe in safe impls

crates/ide/src/syntax_highlighting/highlight.rs

@@ -286,7 +286,9 @@ fn highlight_name_ref(
                     Definition::ModuleDef(hir::ModuleDef::Trait(trait_))
                         if trait_.is_unsafe(db) =>
                     {
-                        if ast::Impl::for_trait_name_ref(&name_ref).is_some() {
+                        if ast::Impl::for_trait_name_ref(&name_ref)
+                            .map_or(false, |impl_| impl_.unsafe_token().is_some())
+                        {
                             h |= HlMod::Unsafe;
                         }
                     }

crates/ide/src/syntax_highlighting/html.rs

@@ -69,6 +69,8 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .function.unsafe    { color: #BC8383; }
 .trait.unsafe       { color: #BC8383; }
 .operator.unsafe    { color: #BC8383; }
+.mutable.unsafe     { color: #BC8383; text-decoration: underline; }
+.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .parameter          { color: #94BFF3; }
 .text               { color: #DCDCCC; }
 .type               { color: #7CB8BB; }
@@ -85,7 +87,6 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .mutable            { text-decoration: underline; }
 .escape_sequence    { color: #94BFF3; }
 .keyword            { color: #F0DFAF; font-weight: bold; }
-.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .control            { font-style: italic; }
 .reference          { font-style: italic; font-weight: bold; }
 

crates/ide/src/syntax_highlighting/test_data/highlight_assoc_functions.html

@@ -17,6 +17,8 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .function.unsafe    { color: #BC8383; }
 .trait.unsafe       { color: #BC8383; }
 .operator.unsafe    { color: #BC8383; }
+.mutable.unsafe     { color: #BC8383; text-decoration: underline; }
+.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .parameter          { color: #94BFF3; }
 .text               { color: #DCDCCC; }
 .type               { color: #7CB8BB; }
@@ -33,7 +35,6 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .mutable            { text-decoration: underline; }
 .escape_sequence    { color: #94BFF3; }
 .keyword            { color: #F0DFAF; font-weight: bold; }
-.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .control            { font-style: italic; }
 .reference          { font-style: italic; font-weight: bold; }
 

crates/ide/src/syntax_highlighting/test_data/highlight_doctest.html

@@ -17,6 +17,8 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .function.unsafe    { color: #BC8383; }
 .trait.unsafe       { color: #BC8383; }
 .operator.unsafe    { color: #BC8383; }
+.mutable.unsafe     { color: #BC8383; text-decoration: underline; }
+.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .parameter          { color: #94BFF3; }
 .text               { color: #DCDCCC; }
 .type               { color: #7CB8BB; }
@@ -33,7 +35,6 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .mutable            { text-decoration: underline; }
 .escape_sequence    { color: #94BFF3; }
 .keyword            { color: #F0DFAF; font-weight: bold; }
-.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .control            { font-style: italic; }
 .reference          { font-style: italic; font-weight: bold; }
 

crates/ide/src/syntax_highlighting/test_data/highlight_extern_crate.html

@@ -17,6 +17,8 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .function.unsafe    { color: #BC8383; }
 .trait.unsafe       { color: #BC8383; }
 .operator.unsafe    { color: #BC8383; }
+.mutable.unsafe     { color: #BC8383; text-decoration: underline; }
+.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .parameter          { color: #94BFF3; }
 .text               { color: #DCDCCC; }
 .type               { color: #7CB8BB; }
@@ -33,7 +35,6 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .mutable            { text-decoration: underline; }
 .escape_sequence    { color: #94BFF3; }
 .keyword            { color: #F0DFAF; font-weight: bold; }
-.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .control            { font-style: italic; }
 .reference          { font-style: italic; font-weight: bold; }
 

crates/ide/src/syntax_highlighting/test_data/highlight_injection.html

@@ -17,6 +17,8 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .function.unsafe    { color: #BC8383; }
 .trait.unsafe       { color: #BC8383; }
 .operator.unsafe    { color: #BC8383; }
+.mutable.unsafe     { color: #BC8383; text-decoration: underline; }
+.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .parameter          { color: #94BFF3; }
 .text               { color: #DCDCCC; }
 .type               { color: #7CB8BB; }
@@ -33,7 +35,6 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .mutable            { text-decoration: underline; }
 .escape_sequence    { color: #94BFF3; }
 .keyword            { color: #F0DFAF; font-weight: bold; }
-.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .control            { font-style: italic; }
 .reference          { font-style: italic; font-weight: bold; }
 

crates/ide/src/syntax_highlighting/test_data/highlight_strings.html

@@ -17,6 +17,8 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .function.unsafe    { color: #BC8383; }
 .trait.unsafe       { color: #BC8383; }
 .operator.unsafe    { color: #BC8383; }
+.mutable.unsafe     { color: #BC8383; text-decoration: underline; }
+.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .parameter          { color: #94BFF3; }
 .text               { color: #DCDCCC; }
 .type               { color: #7CB8BB; }
@@ -33,7 +35,6 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .mutable            { text-decoration: underline; }
 .escape_sequence    { color: #94BFF3; }
 .keyword            { color: #F0DFAF; font-weight: bold; }
-.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .control            { font-style: italic; }
 .reference          { font-style: italic; font-weight: bold; }
 

crates/ide/src/syntax_highlighting/test_data/highlight_unsafe.html

@@ -17,6 +17,8 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .function.unsafe    { color: #BC8383; }
 .trait.unsafe       { color: #BC8383; }
 .operator.unsafe    { color: #BC8383; }
+.mutable.unsafe     { color: #BC8383; text-decoration: underline; }
+.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .parameter          { color: #94BFF3; }
 .text               { color: #DCDCCC; }
 .type               { color: #7CB8BB; }
@@ -33,31 +35,25 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .mutable            { text-decoration: underline; }
 .escape_sequence    { color: #94BFF3; }
 .keyword            { color: #F0DFAF; font-weight: bold; }
-.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .control            { font-style: italic; }
 .reference          { font-style: italic; font-weight: bold; }
 
 .unresolved_reference { color: #FC5555; text-decoration: wavy underline; }
 </style>
-<pre><code><span class="keyword unsafe">unsafe</span> <span class="keyword">fn</span> <span class="function declaration unsafe">unsafe_fn</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span><span class="brace">}</span>
+<pre><code><span class="keyword">static</span> <span class="keyword">mut</span> <span class="static declaration mutable unsafe">MUT_GLOBAL</span><span class="colon">:</span> <span class="struct">Struct</span> <span class="operator">=</span> <span class="struct">Struct</span> <span class="brace">{</span> <span class="field">field</span><span class="colon">:</span> <span class="numeric_literal">0</span> <span class="brace">}</span><span class="semicolon">;</span>
+<span class="keyword">static</span> <span class="static declaration">GLOBAL</span><span class="colon">:</span> <span class="struct">Struct</span> <span class="operator">=</span> <span class="struct">Struct</span> <span class="brace">{</span> <span class="field">field</span><span class="colon">:</span> <span class="numeric_literal">0</span> <span class="brace">}</span><span class="semicolon">;</span>
+<span class="keyword unsafe">unsafe</span> <span class="keyword">fn</span> <span class="function declaration unsafe">unsafe_fn</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span><span class="brace">}</span>
 
 <span class="keyword">union</span> <span class="union declaration">Union</span> <span class="brace">{</span>
     <span class="field declaration">a</span><span class="colon">:</span> <span class="builtin_type">u32</span><span class="comma">,</span>
     <span class="field declaration">b</span><span class="colon">:</span> <span class="builtin_type">f32</span><span class="comma">,</span>
 <span class="brace">}</span>
 
-<span class="keyword">struct</span> <span class="struct declaration">HasUnsafeFn</span><span class="semicolon">;</span>
+<span class="keyword">struct</span> <span class="struct declaration">Struct</span> <span class="brace">{</span> <span class="field declaration">field</span><span class="colon">:</span> <span class="builtin_type">i32</span> <span class="brace">}</span>
-
+<span class="keyword">impl</span> <span class="struct">Struct</span> <span class="brace">{</span>
-<span class="keyword">impl</span> <span class="struct">HasUnsafeFn</span> <span class="brace">{</span>
     <span class="keyword unsafe">unsafe</span> <span class="keyword">fn</span> <span class="function associated declaration reference unsafe">unsafe_method</span><span class="parenthesis">(</span><span class="operator">&</span><span class="self_keyword declaration reference">self</span><span class="parenthesis">)</span> <span class="brace">{</span><span class="brace">}</span>
 <span class="brace">}</span>
 
-<span class="keyword">struct</span> <span class="struct declaration">TypeForStaticMut</span> <span class="brace">{</span>
-    <span class="field declaration">a</span><span class="colon">:</span> <span class="builtin_type">u8</span>
-<span class="brace">}</span>
-
-<span class="keyword">static</span> <span class="keyword">mut</span> <span class="static declaration mutable unsafe">global_mut</span><span class="colon">:</span> <span class="struct">TypeForStaticMut</span> <span class="operator">=</span> <span class="struct">TypeForStaticMut</span> <span class="brace">{</span> <span class="field">a</span><span class="colon">:</span> <span class="numeric_literal">0</span> <span class="brace">}</span><span class="semicolon">;</span>
-
 <span class="attribute attribute">#</span><span class="attribute attribute">[</span><span class="builtin_attr attribute">repr</span><span class="parenthesis attribute">(</span><span class="none attribute">packed</span><span class="parenthesis attribute">)</span><span class="attribute attribute">]</span>
 <span class="keyword">struct</span> <span class="struct declaration">Packed</span> <span class="brace">{</span>
     <span class="field declaration">a</span><span class="colon">:</span> <span class="builtin_type">u16</span><span class="comma">,</span>
@@ -65,8 +61,9 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 
 <span class="keyword unsafe">unsafe</span> <span class="keyword">trait</span> <span class="trait declaration unsafe">UnsafeTrait</span> <span class="brace">{</span><span class="brace">}</span>
 <span class="keyword unsafe">unsafe</span> <span class="keyword">impl</span> <span class="trait unsafe">UnsafeTrait</span> <span class="keyword">for</span> <span class="struct">Packed</span> <span class="brace">{</span><span class="brace">}</span>
+<span class="keyword">impl</span> <span class="punctuation">!</span><span class="trait">UnsafeTrait</span> <span class="keyword">for</span> <span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span><span class="brace">}</span>
 
-<span class="keyword">fn</span> <span class="function declaration">require_unsafe_trait</span><span class="angle">&lt;</span><span class="type_param declaration">T</span><span class="colon">:</span> <span class="trait">UnsafeTrait</span><span class="angle">&gt;</span><span class="parenthesis">(</span><span class="punctuation">_</span><span class="colon">:</span> <span class="type_param">T</span><span class="parenthesis">)</span> <span class="brace">{</span><span class="brace">}</span>
+<span class="keyword">fn</span> <span class="function declaration">unsafe_trait_bound</span><span class="angle">&lt;</span><span class="type_param declaration">T</span><span class="colon">:</span> <span class="trait">UnsafeTrait</span><span class="angle">&gt;</span><span class="parenthesis">(</span><span class="punctuation">_</span><span class="colon">:</span> <span class="type_param">T</span><span class="parenthesis">)</span> <span class="brace">{</span><span class="brace">}</span>
 
 <span class="keyword">trait</span> <span class="trait declaration">DoTheAutoref</span> <span class="brace">{</span>
     <span class="keyword">fn</span> <span class="function associated declaration reference trait">calls_autoref</span><span class="parenthesis">(</span><span class="operator">&</span><span class="self_keyword declaration reference">self</span><span class="parenthesis">)</span><span class="semicolon">;</span>
@@ -87,13 +84,14 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
             <span class="union">Union</span> <span class="brace">{</span> <span class="field unsafe">b</span><span class="colon">:</span> <span class="numeric_literal">0</span> <span class="brace">}</span> <span class="operator">=&gt;</span> <span class="parenthesis">(</span><span class="parenthesis">)</span><span class="comma">,</span>
             <span class="union">Union</span> <span class="brace">{</span> <span class="field unsafe">a</span> <span class="brace">}</span> <span class="operator">=&gt;</span> <span class="parenthesis">(</span><span class="parenthesis">)</span><span class="comma">,</span>
         <span class="brace">}</span>
-        <span class="struct">HasUnsafeFn</span><span class="operator">.</span><span class="function associated reference unsafe">unsafe_method</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
+        <span class="struct">Struct</span> <span class="brace">{</span> <span class="field">field</span><span class="colon">:</span> <span class="numeric_literal">0</span> <span class="brace">}</span><span class="operator">.</span><span class="function associated reference unsafe">unsafe_method</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
 
         <span class="comment">// unsafe deref</span>
-        <span class="keyword">let</span> <span class="variable declaration">y</span> <span class="operator">=</span> <span class="operator unsafe">*</span><span class="variable">x</span><span class="semicolon">;</span>
+        <span class="operator unsafe">*</span><span class="variable">x</span><span class="semicolon">;</span>
 
         <span class="comment">// unsafe access to a static mut</span>
-        <span class="keyword">let</span> <span class="variable declaration">a</span> <span class="operator">=</span> <span class="static mutable unsafe">global_mut</span><span class="operator">.</span><span class="field">a</span><span class="semicolon">;</span>
+        <span class="static mutable unsafe">MUT_GLOBAL</span><span class="operator">.</span><span class="field">field</span><span class="semicolon">;</span>
+        <span class="static">GLOBAL</span><span class="operator">.</span><span class="field">field</span><span class="semicolon">;</span>
 
         <span class="comment">// unsafe ref of packed fields</span>
         <span class="keyword">let</span> <span class="variable declaration">packed</span> <span class="operator">=</span> <span class="struct">Packed</span> <span class="brace">{</span> <span class="field">a</span><span class="colon">:</span> <span class="numeric_literal">0</span> <span class="brace">}</span><span class="semicolon">;</span>

crates/ide/src/syntax_highlighting/test_data/highlighting.html

@@ -17,6 +17,8 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .function.unsafe    { color: #BC8383; }
 .trait.unsafe       { color: #BC8383; }
 .operator.unsafe    { color: #BC8383; }
+.mutable.unsafe     { color: #BC8383; text-decoration: underline; }
+.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .parameter          { color: #94BFF3; }
 .text               { color: #DCDCCC; }
 .type               { color: #7CB8BB; }
@@ -33,7 +35,6 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .mutable            { text-decoration: underline; }
 .escape_sequence    { color: #94BFF3; }
 .keyword            { color: #F0DFAF; font-weight: bold; }
-.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .control            { font-style: italic; }
 .reference          { font-style: italic; font-weight: bold; }
 
@@ -116,8 +117,6 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
     <span class="function">str</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
 <span class="brace">}</span>
 
-<span class="keyword">static</span> <span class="keyword">mut</span> <span class="static declaration mutable unsafe">STATIC_MUT</span><span class="colon">:</span> <span class="builtin_type">i32</span> <span class="operator">=</span> <span class="numeric_literal">0</span><span class="semicolon">;</span>
-
 <span class="keyword">fn</span> <span class="function declaration">foo</span><span class="angle">&lt;</span><span class="lifetime declaration">'a</span><span class="comma">,</span> <span class="type_param declaration">T</span><span class="angle">&gt;</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="operator">-&gt;</span> <span class="type_param">T</span> <span class="brace">{</span>
     <span class="function">foo</span><span class="operator">::</span><span class="angle">&lt;</span><span class="lifetime">'a</span><span class="comma">,</span> <span class="builtin_type">i32</span><span class="angle">&gt;</span><span class="parenthesis">(</span><span class="parenthesis">)</span>
 <span class="brace">}</span>
@@ -185,10 +184,6 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
         <span class="keyword">let</span> <span class="variable declaration">x</span> <span class="operator">=</span> <span class="numeric_literal">92</span><span class="semicolon">;</span>
         <span class="variable mutable">vec</span><span class="operator">.</span><span class="unresolved_reference">push</span><span class="parenthesis">(</span><span class="struct">Foo</span> <span class="brace">{</span> <span class="field">x</span><span class="comma">,</span> <span class="field public">y</span><span class="colon">:</span> <span class="numeric_literal">1</span> <span class="brace">}</span><span class="parenthesis">)</span><span class="semicolon">;</span>
     <span class="brace">}</span>
-    <span class="keyword unsafe">unsafe</span> <span class="brace">{</span>
-        <span class="variable mutable">vec</span><span class="operator">.</span><span class="unresolved_reference">set_len</span><span class="parenthesis">(</span><span class="numeric_literal">0</span><span class="parenthesis">)</span><span class="semicolon">;</span>
-        <span class="static mutable unsafe">STATIC_MUT</span> <span class="operator">=</span> <span class="numeric_literal">1</span><span class="semicolon">;</span>
-    <span class="brace">}</span>
 
     <span class="keyword control">for</span> <span class="variable declaration">e</span> <span class="keyword control">in</span> <span class="variable mutable">vec</span> <span class="brace">{</span>
         <span class="comment">// Do nothing</span>
@@ -256,9 +251,6 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
     futures::<span class="macro">join!</span><span class="parenthesis">(</span>f1<span class="comma">,</span> f2<span class="parenthesis">)</span><span class="semicolon">;</span>
 <span class="brace">}</span>
 
-<span class="keyword unsafe">unsafe</span> <span class="keyword">trait</span> <span class="trait declaration unsafe">Dangerous</span> <span class="brace">{</span><span class="brace">}</span>
-<span class="keyword">impl</span> <span class="trait unsafe">Dangerous</span> <span class="keyword">for</span> <span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span><span class="brace">}</span>
-
 <span class="keyword">fn</span> <span class="function declaration">use_foo_items</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
     <span class="keyword">let</span> <span class="variable declaration">bob</span> <span class="operator">=</span> <span class="module library">foo</span><span class="operator">::</span><span class="struct library">Person</span> <span class="brace">{</span>
         <span class="field library">name</span><span class="colon">:</span> <span class="string_literal">"Bob"</span><span class="comma">,</span>

crates/ide/src/syntax_highlighting/test_data/injection.html

@@ -17,6 +17,8 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .function.unsafe    { color: #BC8383; }
 .trait.unsafe       { color: #BC8383; }
 .operator.unsafe    { color: #BC8383; }
+.mutable.unsafe     { color: #BC8383; text-decoration: underline; }
+.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .parameter          { color: #94BFF3; }
 .text               { color: #DCDCCC; }
 .type               { color: #7CB8BB; }
@@ -33,7 +35,6 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .mutable            { text-decoration: underline; }
 .escape_sequence    { color: #94BFF3; }
 .keyword            { color: #F0DFAF; font-weight: bold; }
-.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .control            { font-style: italic; }
 .reference          { font-style: italic; font-weight: bold; }
 

crates/ide/src/syntax_highlighting/test_data/rainbow_highlighting.html

@@ -17,6 +17,8 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .function.unsafe    { color: #BC8383; }
 .trait.unsafe       { color: #BC8383; }
 .operator.unsafe    { color: #BC8383; }
+.mutable.unsafe     { color: #BC8383; text-decoration: underline; }
+.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .parameter          { color: #94BFF3; }
 .text               { color: #DCDCCC; }
 .type               { color: #7CB8BB; }
@@ -33,7 +35,6 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .mutable            { text-decoration: underline; }
 .escape_sequence    { color: #94BFF3; }
 .keyword            { color: #F0DFAF; font-weight: bold; }
-.keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .control            { font-style: italic; }
 .reference          { font-style: italic; font-weight: bold; }
 

crates/ide/src/syntax_highlighting/tests.rs

@@ -89,8 +89,6 @@ fn str() {
     str();
 }
 
-static mut STATIC_MUT: i32 = 0;
-
 fn foo<'a, T>() -> T {
     foo::<'a, i32>()
 }
@@ -158,10 +156,6 @@ fn main() {
         let x = 92;
         vec.push(Foo { x, y: 1 });
     }
-    unsafe {
-        vec.set_len(0);
-        STATIC_MUT = 1;
-    }
 
     for e in vec {
         // Do nothing
@@ -229,9 +223,6 @@ async fn async_main() {
     futures::join!(f1, f2);
 }
 
-unsafe trait Dangerous {}
-impl Dangerous for () {}
-
 fn use_foo_items() {
     let bob = foo::Person {
         name: "Bob",
@@ -514,6 +505,8 @@ fn main() {
 fn test_unsafe_highlighting() {
     check_highlighting(
         r#"
+static mut MUT_GLOBAL: Struct = Struct { field: 0 };
+static GLOBAL: Struct = Struct { field: 0 };
 unsafe fn unsafe_fn() {}
 
 union Union {
@@ -521,18 +514,11 @@ union Union {
     b: f32,
 }
 
-struct HasUnsafeFn;
+struct Struct { field: i32 }
-
+impl Struct {
-impl HasUnsafeFn {
     unsafe fn unsafe_method(&self) {}
 }
 
-struct TypeForStaticMut {
-    a: u8
-}
-
-static mut global_mut: TypeForStaticMut = TypeForStaticMut { a: 0 };
-
 #[repr(packed)]
 struct Packed {
     a: u16,
@@ -540,8 +526,9 @@ struct Packed {
 
 unsafe trait UnsafeTrait {}
 unsafe impl UnsafeTrait for Packed {}
+impl !UnsafeTrait for () {}
 
-fn require_unsafe_trait<T: UnsafeTrait>(_: T) {}
+fn unsafe_trait_bound<T: UnsafeTrait>(_: T) {}
 
 trait DoTheAutoref {
     fn calls_autoref(&self);
@@ -562,13 +549,14 @@ fn main() {
             Union { b: 0 } => (),
             Union { a } => (),
         }
-        HasUnsafeFn.unsafe_method();
+        Struct { field: 0 }.unsafe_method();
 
         // unsafe deref
-        let y = *x;
+        *x;
 
         // unsafe access to a static mut
-        let a = global_mut.a;
+        MUT_GLOBAL.field;
+        GLOBAL.field;
 
         // unsafe ref of packed fields
         let packed = Packed { a: 0 };