13 files changed, 144 insertions, 71 deletions
diff --git a/crates/ra_hir/src/semantics.rs b/crates/ra_hir/src/semantics.rs
index eecccdae2..178d74be1 100644
--- a/crates/ra_hir/src/semantics.rs
+++ b/crates/ra_hir/src/semantics.rs
@@ -17,8 +17,8 @@ use crate::{
    db::HirDatabase,
    source_analyzer::{resolve_hir_path, ReferenceDescriptor, SourceAnalyzer},
    source_binder::{ChildContainer, SourceBinder},
-    Function, HirFileId, InFile, Local, MacroDef, Module, Name, Origin, Path, PathResolution,
+    Function, HirFileId, InFile, Local, MacroDef, Module, ModuleDef, Name, Origin, Path,
-    ScopeDef, StructField, Trait, Type, TypeParam, VariantDef,
+    PathResolution, ScopeDef, StructField, Trait, Type, TypeParam, VariantDef,
 };
 use hir_expand::ExpansionInfo;
 use ra_prof::profile;
@@ -129,6 +129,10 @@ impl<'db, DB: HirDatabase> Semantics<'db, DB> {
        self.analyze(path.syntax()).resolve_path(self.db, path)
    }
+    pub fn resolve_bind_pat_to_const(&self, pat: &ast::BindPat) -> Option<ModuleDef> {
+        self.analyze(pat.syntax()).resolve_bind_pat_to_const(self.db, pat)
+    }
    // FIXME: use this instead?
    // pub fn resolve_name_ref(&self, name_ref: &ast::NameRef) -> Option<???>;
diff --git a/crates/ra_hir/src/source_analyzer.rs b/crates/ra_hir/src/source_analyzer.rs
index b655e2c32..c650a9e08 100644
--- a/crates/ra_hir/src/source_analyzer.rs
+++ b/crates/ra_hir/src/source_analyzer.rs
@@ -11,9 +11,9 @@ use either::Either;
 use hir_def::{
    body::{
        scope::{ExprScopes, ScopeId},
-        BodySourceMap,
+        Body, BodySourceMap,
    },
-    expr::{ExprId, PatId},
+    expr::{ExprId, Pat, PatId},
    resolver::{resolver_for_scope, Resolver, TypeNs, ValueNs},
    AsMacroCall, DefWithBodyId,
 };
@@ -25,8 +25,8 @@ use ra_syntax::{
 };
 use crate::{
-    db::HirDatabase, Adt, Const, EnumVariant, Function, Local, MacroDef, Path, Static, Struct,
+    db::HirDatabase, Adt, Const, EnumVariant, Function, Local, MacroDef, ModuleDef, Path, Static,
-    Trait, Type, TypeAlias, TypeParam,
+    Struct, Trait, Type, TypeAlias, TypeParam,
 };
 /// `SourceAnalyzer` is a convenience wrapper which exposes HIR API in terms of
@@ -35,6 +35,7 @@ use crate::{
 pub(crate) struct SourceAnalyzer {
    file_id: HirFileId,
    pub(crate) resolver: Resolver,
+    body: Option<Arc<Body>>,
    body_source_map: Option<Arc<BodySourceMap>>,
    infer: Option<Arc<InferenceResult>>,
    scopes: Option<Arc<ExprScopes>>,
@@ -66,7 +67,7 @@ impl SourceAnalyzer {
        node: InFile<&SyntaxNode>,
        offset: Option<TextUnit>,
    ) -> SourceAnalyzer {
-        let (_body, source_map) = db.body_with_source_map(def);
+        let (body, source_map) = db.body_with_source_map(def);
        let scopes = db.expr_scopes(def);
        let scope = match offset {
            None => scope_for(&scopes, &source_map, node),
@@ -75,6 +76,7 @@ impl SourceAnalyzer {
        let resolver = resolver_for_scope(db, def, scope);
        SourceAnalyzer {
            resolver,
+            body: Some(body),
            body_source_map: Some(source_map),
            infer: Some(db.infer(def)),
            scopes: Some(scopes),
@@ -88,6 +90,7 @@ impl SourceAnalyzer {
    ) -> SourceAnalyzer {
        SourceAnalyzer {
            resolver,
+            body: None,
            body_source_map: None,
            infer: None,
            scopes: None,
@@ -197,6 +200,24 @@ impl SourceAnalyzer {
        self.resolver.resolve_path_as_macro(db, path.mod_path()).map(|it| it.into())
    }
+    pub(crate) fn resolve_bind_pat_to_const(
+        &self,
+        db: &impl HirDatabase,
+        pat: &ast::BindPat,
+    ) -> Option<ModuleDef> {
+        let pat_id = self.pat_id(&pat.clone().into())?;
+        let body = self.body.as_ref()?;
+        let path = match &body[pat_id] {
+            Pat::Path(path) => path,
+            _ => return None,
+        };
+        let res = resolve_hir_path(db, &self.resolver, &path)?;
+        match res {
+            PathResolution::Def(def) => Some(def),
+            _ => None,
+        }
+    }
    pub(crate) fn resolve_path(
        &self,
        db: &impl HirDatabase,
diff --git a/crates/ra_ide/src/goto_definition.rs b/crates/ra_ide/src/goto_definition.rs
index 6053c1bb6..621ab982c 100644
--- a/crates/ra_ide/src/goto_definition.rs
+++ b/crates/ra_ide/src/goto_definition.rs
@@ -30,7 +30,9 @@ pub(crate) fn goto_definition(
                reference_definition(&sema, &name_ref).to_vec()
            },
            ast::Name(name) => {
-                name_definition(&sema, &name)?
+                let def = classify_name(&sema, &name)?.definition();
+                let nav = def.try_to_nav(sema.db)?;
+                vec![nav]
            },
            _ => return None,
        }
@@ -88,15 +90,6 @@ pub(crate) fn reference_definition(
    Approximate(navs)
 }
-fn name_definition(
-    sema: &Semantics<RootDatabase>,
-    name: &ast::Name,
-) -> Option<Vec<NavigationTarget>> {
-    let def = classify_name(sema, name)?;
-    let nav = def.try_to_nav(sema.db)?;
-    Some(vec![nav])
-}
 #[cfg(test)]
 mod tests {
    use test_utils::{assert_eq_text, covers};
diff --git a/crates/ra_ide/src/hover.rs b/crates/ra_ide/src/hover.rs
index cc79f1fab..5073bb1cf 100644
--- a/crates/ra_ide/src/hover.rs
+++ b/crates/ra_ide/src/hover.rs
@@ -156,7 +156,7 @@ pub(crate) fn hover(db: &RootDatabase, position: FilePosition) -> Option<RangeIn
                classify_name_ref(&sema, &name_ref).map(|d| (name_ref.syntax().clone(), d))
            },
            ast::Name(name) => {
-                classify_name(&sema, &name).map(|d| (name.syntax().clone(), d))
+                classify_name(&sema, &name).map(|d| (name.syntax().clone(), d.definition()))
            },
            _ => None,
        }
@@ -785,13 +785,13 @@ fn func(foo: i32) { if true { <|>foo; }; }
    fn test_hover_through_literal_string_in_builtin_macro() {
        check_hover_no_result(
            r#"
-            //- /lib.rs            
+            //- /lib.rs
            #[rustc_builtin_macro]
            macro_rules! assert {
                ($cond:expr) => {{ /* compiler built-in */ }};
                ($cond:expr,) => {{ /* compiler built-in */ }};
                ($cond:expr, $($arg:tt)+) => {{ /* compiler built-in */ }};
-            }        
+            }
            fn foo() {
                assert!("hel<|>lo");
diff --git a/crates/ra_ide/src/references.rs b/crates/ra_ide/src/references.rs
index baa8a4d29..f763013ae 100644
--- a/crates/ra_ide/src/references.rs
+++ b/crates/ra_ide/src/references.rs
@@ -155,7 +155,7 @@ fn find_name(
    opt_name: Option<ast::Name>,
 ) -> Option<RangeInfo<(String, NameDefinition)>> {
    if let Some(name) = opt_name {
-        let def = classify_name(sema, &name)?;
+        let def = classify_name(sema, &name)?.definition();
        let range = name.syntax().text_range();
        return Some(RangeInfo::new(range, (name.text().to_string(), def)));
    }
diff --git a/crates/ra_ide/src/snapshots/highlighting.html b/crates/ra_ide/src/snapshots/highlighting.html
index 8c372ad27..495b07f69 100644
--- a/crates/ra_ide/src/snapshots/highlighting.html
+++ b/crates/ra_ide/src/snapshots/highlighting.html
@@ -3,7 +3,7 @@
 body                { margin: 0; }
 pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padding: 0.4em; }
+.lifetime           { color: #DFAF8F; font-style: italic; }
 .comment            { color: #7F9F7F; }
 .struct, .enum      { color: #7CB8BB; }
 .enum_variant       { color: #BDE0F3; }
@@ -27,14 +27,13 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .control            { font-style: italic; }
 </style>
 <pre><code><span class="attribute">#</span><span class="attribute">[</span><span class="attribute">derive</span><span class="attribute">(</span><span class="attribute">Clone</span><span class="attribute">,</span><span class="attribute"> </span><span class="attribute">Debug</span><span class="attribute">)</span><span class="attribute">]</span>
-<span class="keyword">struct</span> <span class="struct">Foo</span> {
+<span class="keyword">struct</span> <span class="struct declaration">Foo</span> {
-    <span class="keyword">pub</span> <span class="field">x</span>: <span class="builtin_type">i32</span>,
+    <span class="keyword">pub</span> <span class="field declaration">x</span>: <span class="builtin_type">i32</span>,
-    <span class="keyword">pub</span> <span class="field">y</span>: <span class="builtin_type">i32</span>,
+    <span class="keyword">pub</span> <span class="field declaration">y</span>: <span class="builtin_type">i32</span>,
 }
-<span class="keyword">fn</span> <span class="function">foo</span>&lt;<span class="type_param">T</span>&gt;() -&gt; <span class="type_param">T</span> {
+<span class="keyword">fn</span> <span class="function declaration">foo</span>&lt;<span class="lifetime declaration">'a</span>, <span class="type_param declaration">T</span>&gt;() -&gt; <span class="type_param">T</span> {
-    <span class="macro">unimplemented</span><span class="macro">!</span>();
+    <span class="function">foo</span>::&lt;<span class="lifetime">'a</span>, <span class="builtin_type">i32</span>&gt;()
-    <span class="function">foo</span>::&lt;<span class="builtin_type">i32</span>&gt;();
 }
 <span class="macro">macro_rules</span><span class="macro">!</span> def_fn {
@@ -42,33 +41,40 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 }
 <span class="macro">def_fn</span><span class="macro">!</span> {
-    <span class="keyword">fn</span> <span class="function">bar</span>() -&gt; <span class="builtin_type">u32</span> {
+    <span class="keyword">fn</span> <span class="function declaration">bar</span>() -&gt; <span class="builtin_type">u32</span> {
        <span class="numeric_literal">100</span>
    }
 }
 <span class="comment">// comment</span>
-<span class="keyword">fn</span> <span class="function">main</span>() {
+<span class="keyword">fn</span> <span class="function declaration">main</span>() {
    <span class="macro">println</span><span class="macro">!</span>(<span class="string_literal">"Hello, {}!"</span>, <span class="numeric_literal">92</span>);
-    <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable mutable">vec</span> = Vec::new();
+    <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable">vec</span> = Vec::new();
    <span class="keyword control">if</span> <span class="keyword">true</span> {
-        <span class="keyword">let</span> <span class="variable">x</span> = <span class="numeric_literal">92</span>;
+        <span class="keyword">let</span> <span class="variable declaration">x</span> = <span class="numeric_literal">92</span>;
        <span class="variable mutable">vec</span>.push(<span class="struct">Foo</span> { <span class="field">x</span>, <span class="field">y</span>: <span class="numeric_literal">1</span> });
    }
    <span class="keyword unsafe">unsafe</span> { <span class="variable mutable">vec</span>.set_len(<span class="numeric_literal">0</span>); }
-    <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable mutable">x</span> = <span class="numeric_literal">42</span>;
+    <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable">x</span> = <span class="numeric_literal">42</span>;
-    <span class="keyword">let</span> <span class="variable mutable">y</span> = &<span class="keyword">mut</span> <span class="variable mutable">x</span>;
+    <span class="keyword">let</span> <span class="variable declaration mutable">y</span> = &<span class="keyword">mut</span> <span class="variable mutable">x</span>;
-    <span class="keyword">let</span> <span class="variable">z</span> = &<span class="variable mutable">y</span>;
+    <span class="keyword">let</span> <span class="variable declaration">z</span> = &<span class="variable mutable">y</span>;
    <span class="variable mutable">y</span>;
 }
-<span class="keyword">enum</span> <span class="enum">E</span>&lt;<span class="type_param">X</span>&gt; {
+<span class="keyword">enum</span> <span class="enum declaration">Option</span>&lt;<span class="type_param declaration">T</span>&gt; {
-    <span class="enum_variant">V</span>(<span class="type_param">X</span>)
+    <span class="enum_variant declaration">Some</span>(<span class="type_param">T</span>),
+    <span class="enum_variant declaration">None</span>,
 }
+<span class="keyword">use</span> <span class="enum">Option</span>::*;
-<span class="keyword">impl</span>&lt;<span class="type_param">X</span>&gt; <span class="enum">E</span>&lt;<span class="type_param">X</span>&gt; {
+<span class="keyword">impl</span>&lt;<span class="type_param declaration">T</span>&gt; <span class="enum">Option</span>&lt;<span class="type_param">T</span>&gt; {
-    <span class="keyword">fn</span> <span class="function">new</span>&lt;<span class="type_param">T</span>&gt;() -&gt; <span class="enum">E</span>&lt;<span class="type_param">T</span>&gt; {}
+    <span class="keyword">fn</span> <span class="function declaration">and</span>&lt;<span class="type_param declaration">U</span>&gt;(<span class="keyword">self</span>, <span class="variable declaration">other</span>: <span class="enum">Option</span>&lt;<span class="type_param">U</span>&gt;) -&gt; <span class="enum">Option</span>&lt;(<span class="type_param">T</span>, <span class="type_param">U</span>)&gt; {
+        <span class="keyword control">match</span> <span class="variable">other</span> {
+            <span class="enum_variant">None</span> =&gt; <span class="macro">unimplemented</span><span class="macro">!</span>(),
+            <span class="variable declaration">Nope</span> =&gt; <span class="variable">Nope</span>,
+        }
+    }
 }</code></pre>
 \ No newline at end of file
diff --git a/crates/ra_ide/src/snapshots/rainbow_highlighting.html b/crates/ra_ide/src/snapshots/rainbow_highlighting.html
index f63e64b6d..dddbfc0dd 100644
--- a/crates/ra_ide/src/snapshots/rainbow_highlighting.html
+++ b/crates/ra_ide/src/snapshots/rainbow_highlighting.html
@@ -3,7 +3,7 @@
 body                { margin: 0; }
 pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padding: 0.4em; }
+.lifetime           { color: #DFAF8F; font-style: italic; }
 .comment            { color: #7F9F7F; }
 .struct, .enum      { color: #7CB8BB; }
 .enum_variant       { color: #BDE0F3; }
@@ -26,15 +26,15 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .control            { font-style: italic; }
 </style>
-<pre><code><span class="keyword">fn</span> <span class="function">main</span>() {
+<pre><code><span class="keyword">fn</span> <span class="function declaration">main</span>() {
-    <span class="keyword">let</span> <span class="variable" data-binding-hash="8121853618659664005" style="color: hsl(261,57%,61%);">hello</span> = <span class="string_literal">"hello"</span>;
+    <span class="keyword">let</span> <span class="variable declaration" data-binding-hash="8121853618659664005" style="color: hsl(261,57%,61%);">hello</span> = <span class="string_literal">"hello"</span>;
-    <span class="keyword">let</span> <span class="variable" data-binding-hash="2705725358298919760" style="color: hsl(17,51%,74%);">x</span> = <span class="variable" data-binding-hash="8121853618659664005" style="color: hsl(261,57%,61%);">hello</span>.to_string();
+    <span class="keyword">let</span> <span class="variable declaration" data-binding-hash="2705725358298919760" style="color: hsl(17,51%,74%);">x</span> = <span class="variable" data-binding-hash="8121853618659664005" style="color: hsl(261,57%,61%);">hello</span>.to_string();
-    <span class="keyword">let</span> <span class="variable" data-binding-hash="3365759661443752373" style="color: hsl(127,76%,66%);">y</span> = <span class="variable" data-binding-hash="8121853618659664005" style="color: hsl(261,57%,61%);">hello</span>.to_string();
+    <span class="keyword">let</span> <span class="variable declaration" data-binding-hash="3365759661443752373" style="color: hsl(127,76%,66%);">y</span> = <span class="variable" data-binding-hash="8121853618659664005" style="color: hsl(261,57%,61%);">hello</span>.to_string();
-    <span class="keyword">let</span> <span class="variable" data-binding-hash="794745962933817518" style="color: hsl(19,74%,76%);">x</span> = <span class="string_literal">"other color please!"</span>;
+    <span class="keyword">let</span> <span class="variable declaration" data-binding-hash="794745962933817518" style="color: hsl(19,74%,76%);">x</span> = <span class="string_literal">"other color please!"</span>;
-    <span class="keyword">let</span> <span class="variable" data-binding-hash="6717528807933952652" style="color: hsl(85,49%,84%);">y</span> = <span class="variable" data-binding-hash="794745962933817518" style="color: hsl(19,74%,76%);">x</span>.to_string();
+    <span class="keyword">let</span> <span class="variable declaration" data-binding-hash="6717528807933952652" style="color: hsl(85,49%,84%);">y</span> = <span class="variable" data-binding-hash="794745962933817518" style="color: hsl(19,74%,76%);">x</span>.to_string();
 }
-<span class="keyword">fn</span> <span class="function">bar</span>() {
+<span class="keyword">fn</span> <span class="function declaration">bar</span>() {
-    <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable mutable" data-binding-hash="8121853618659664005" style="color: hsl(261,57%,61%);">hello</span> = <span class="string_literal">"hello"</span>;
+    <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable" data-binding-hash="8121853618659664005" style="color: hsl(261,57%,61%);">hello</span> = <span class="string_literal">"hello"</span>;
 }</code></pre>
 \ No newline at end of file
diff --git a/crates/ra_ide/src/syntax_highlighting.rs b/crates/ra_ide/src/syntax_highlighting.rs
index c0f7c1c9f..b94b6a022 100644
--- a/crates/ra_ide/src/syntax_highlighting.rs
+++ b/crates/ra_ide/src/syntax_highlighting.rs
@@ -7,7 +7,7 @@ mod tests;
 use hir::{Name, Semantics};
 use ra_ide_db::{
-    defs::{classify_name, NameDefinition},
+    defs::{classify_name, NameClass, NameDefinition},
    RootDatabase,
 };
 use ra_prof::profile;
@@ -169,7 +169,7 @@ fn highlight_element(
            let name = element.into_node().and_then(ast::Name::cast).unwrap();
            let name_kind = classify_name(sema, &name);
-            if let Some(NameDefinition::Local(local)) = &name_kind {
+            if let Some(NameClass::NameDefinition(NameDefinition::Local(local))) = &name_kind {
                if let Some(name) = local.name(db) {
                    let shadow_count = bindings_shadow_count.entry(name.clone()).or_default();
                    *shadow_count += 1;
@@ -177,11 +177,13 @@ fn highlight_element(
                }
            };
-            let h = match name_kind {
+            match name_kind {
-                Some(name_kind) => highlight_name(db, name_kind),
+                Some(NameClass::NameDefinition(def)) => {
-                None => highlight_name_by_syntax(name),
+                    highlight_name(db, def) | HighlightModifier::Definition
-            };
+                }
-            h | HighlightModifier::Definition
+                Some(NameClass::ConstReference(def)) => highlight_name(db, def),
+                None => highlight_name_by_syntax(name) | HighlightModifier::Definition,
+            }
        }
        // Highlight references like the definitions they resolve to
@@ -212,8 +214,13 @@ fn highlight_element(
        INT_NUMBER | FLOAT_NUMBER => HighlightTag::NumericLiteral.into(),
        BYTE => HighlightTag::ByteLiteral.into(),
        CHAR => HighlightTag::CharLiteral.into(),
-        // FIXME: set Declaration for decls
+        LIFETIME => {
-        LIFETIME => HighlightTag::Lifetime.into(),
+            let h = Highlight::new(HighlightTag::Lifetime);
+            dbg!(match element.parent().map(|it| it.kind()) {
+                Some(LIFETIME_PARAM) | Some(LABEL) => h | HighlightModifier::Definition,
+                _ => h,
+            })
+        }
        k if k.is_keyword() => {
            let h = Highlight::new(HighlightTag::Keyword);
diff --git a/crates/ra_ide/src/syntax_highlighting/html.rs b/crates/ra_ide/src/syntax_highlighting/html.rs
index 54678c278..e13766c9d 100644
--- a/crates/ra_ide/src/syntax_highlighting/html.rs
+++ b/crates/ra_ide/src/syntax_highlighting/html.rs
@@ -80,7 +80,7 @@ const STYLE: &str = "
 body                { margin: 0; }
 pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padding: 0.4em; }
+.lifetime           { color: #DFAF8F; font-style: italic; }
 .comment            { color: #7F9F7F; }
 .struct, .enum      { color: #7CB8BB; }
 .enum_variant       { color: #BDE0F3; }
diff --git a/crates/ra_ide/src/syntax_highlighting/tags.rs b/crates/ra_ide/src/syntax_highlighting/tags.rs
index 9da80823c..8835a5de2 100644
--- a/crates/ra_ide/src/syntax_highlighting/tags.rs
+++ b/crates/ra_ide/src/syntax_highlighting/tags.rs
@@ -90,8 +90,12 @@ impl fmt::Display for HighlightTag {
 }
 impl HighlightModifier {
-    const ALL: &'static [HighlightModifier] =
+    const ALL: &'static [HighlightModifier] = &[
-        &[HighlightModifier::Mutable, HighlightModifier::Unsafe, HighlightModifier::Control];
+        HighlightModifier::Control,
+        HighlightModifier::Definition,
+        HighlightModifier::Mutable,
+        HighlightModifier::Unsafe,
+    ];
    fn as_str(self) -> &'static str {
        match self {
diff --git a/crates/ra_ide/src/syntax_highlighting/tests.rs b/crates/ra_ide/src/syntax_highlighting/tests.rs
index 2d90a072f..98c030791 100644
--- a/crates/ra_ide/src/syntax_highlighting/tests.rs
+++ b/crates/ra_ide/src/syntax_highlighting/tests.rs
@@ -17,9 +17,8 @@ struct Foo {
    pub y: i32,
 }
-fn foo<T>() -> T {
+fn foo<'a, T>() -> T {
-    unimplemented!();
+    foo::<'a, i32>()
-    foo::<i32>();
 }
 macro_rules! def_fn {
@@ -50,12 +49,19 @@ fn main() {
    y;
 }
-enum E<X> {
+enum Option<T> {
-    V(X)
+    Some(T),
+    None,
 }
+use Option::*;
-impl<X> E<X> {
-    fn new<T>() -> E<T> {}
+impl<T> Option<T> {
+    fn and<U>(self, other: Option<U>) -> Option<(T, U)> {
+        match other {
+            None => unimplemented!(),
+            Nope => Nope,
+        }
+    }
 }
 "#
        .trim(),
@@ -123,5 +129,5 @@ fn test_ranges() {
        .highlight_range(FileRange { file_id, range: TextRange::offset_len(82.into(), 1.into()) })
        .unwrap();
-    assert_eq!(&highlights[0].highlight.to_string(), "field");
+    assert_eq!(&highlights[0].highlight.to_string(), "field.declaration");
 }
diff --git a/crates/ra_ide_db/src/defs.rs b/crates/ra_ide_db/src/defs.rs
index 484755158..93f32ba85 100644
--- a/crates/ra_ide_db/src/defs.rs
+++ b/crates/ra_ide_db/src/defs.rs
@@ -68,7 +68,38 @@ impl NameDefinition {
    }
 }
-pub fn classify_name(sema: &Semantics<RootDatabase>, name: &ast::Name) -> Option<NameDefinition> {
+pub enum NameClass {
+    NameDefinition(NameDefinition),
+    /// `None` in `if let None = Some(82) {}`
+    ConstReference(NameDefinition),
+}
+impl NameClass {
+    pub fn into_definition(self) -> Option<NameDefinition> {
+        match self {
+            NameClass::NameDefinition(it) => Some(it),
+            NameClass::ConstReference(_) => None,
+        }
+    }
+    pub fn definition(self) -> NameDefinition {
+        match self {
+            NameClass::NameDefinition(it) | NameClass::ConstReference(it) => it,
+        }
+    }
+}
+pub fn classify_name(sema: &Semantics<RootDatabase>, name: &ast::Name) -> Option<NameClass> {
+    if let Some(bind_pat) = name.syntax().parent().and_then(ast::BindPat::cast) {
+        if let Some(def) = sema.resolve_bind_pat_to_const(&bind_pat) {
+            return Some(NameClass::ConstReference(NameDefinition::ModuleDef(def)));
+        }
+    }
+    classify_name_inner(sema, name).map(NameClass::NameDefinition)
+}
+fn classify_name_inner(sema: &Semantics<RootDatabase>, name: &ast::Name) -> Option<NameDefinition> {
    let _p = profile("classify_name");
    let parent = name.syntax().parent()?;
diff --git a/crates/ra_ide_db/src/imports_locator.rs b/crates/ra_ide_db/src/imports_locator.rs
index e590d2a5c..e5fc3c470 100644
--- a/crates/ra_ide_db/src/imports_locator.rs
+++ b/crates/ra_ide_db/src/imports_locator.rs
@@ -59,6 +59,7 @@ impl<'a> ImportsLocator<'a> {
        } else {
            candidate_node
        };
-        classify_name(&self.sema, &ast::Name::cast(candidate_name_node)?)
+        let name = ast::Name::cast(candidate_name_node)?;
+        classify_name(&self.sema, &name)?.into_definition()
    }
 }