From bed12833cc4ce7c6b4085ba8dc47fc167c83f8ea Mon Sep 17 00:00:00 2001
From: Lukas Wirth <lukastw97@gmail.com>
Date: Tue, 19 Jan 2021 20:01:49 +0100
Subject: Show const params in completions

---
 .../completion/src/completions/unqualified_path.rs | 24 ++++++++++++++++++++-
 crates/hir/src/code_model.rs                       |  2 +-
 crates/hir/src/semantics.rs                        |  2 +-
 crates/hir_def/src/resolver.rs                     | 25 ++++++++++++++--------
 4 files changed, 41 insertions(+), 12 deletions(-)

diff --git a/crates/completion/src/completions/unqualified_path.rs b/crates/completion/src/completions/unqualified_path.rs
index ac5596ca4..809e1645a 100644
--- a/crates/completion/src/completions/unqualified_path.rs
+++ b/crates/completion/src/completions/unqualified_path.rs
@@ -29,6 +29,10 @@ pub(crate) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC
     }
 
     ctx.scope.process_all_names(&mut |name, res| {
+        if let ScopeDef::GenericParam(hir::GenericParam::LifetimeParam(_)) = res {
+            mark::hit!(skip_lifetime_completion);
+            return;
+        }
         if ctx.use_item_syntax.is_some() {
             if let (ScopeDef::Unknown, Some(name_ref)) = (&res, &ctx.name_ref_syntax) {
                 if name_ref.syntax().text() == name.to_string().as_str() {
@@ -37,7 +41,7 @@ pub(crate) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC
                 }
             }
         }
-        acc.add_resolution(ctx, name.to_string(), &res)
+        acc.add_resolution(ctx, name.to_string(), &res);
     });
 }
 
@@ -234,6 +238,24 @@ fn main() {
                 fn quux() fn quux<T>()
             "#]],
         );
+        check(
+            r#"fn quux<const C: usize>() { $0 }"#,
+            expect![[r#"
+                tp C
+                fn quux() fn quux<const C: usize>()
+            "#]],
+        );
+    }
+
+    #[test]
+    fn does_not_complete_lifetimes() {
+        mark::check!(skip_lifetime_completion);
+        check(
+            r#"fn quux<'a>() { $0 }"#,
+            expect![[r#"
+                fn quux() fn quux<'a>()
+            "#]],
+        );
     }
 
     #[test]
diff --git a/crates/hir/src/code_model.rs b/crates/hir/src/code_model.rs
index 2950f08b8..6f48322db 100644
--- a/crates/hir/src/code_model.rs
+++ b/crates/hir/src/code_model.rs
@@ -2045,7 +2045,7 @@ impl Callable {
 pub enum ScopeDef {
     ModuleDef(ModuleDef),
     MacroDef(MacroDef),
-    GenericParam(TypeParam),
+    GenericParam(GenericParam),
     ImplSelfType(Impl),
     AdtSelfType(Adt),
     Local(Local),
diff --git a/crates/hir/src/semantics.rs b/crates/hir/src/semantics.rs
index ab213e04c..0a30b4f5b 100644
--- a/crates/hir/src/semantics.rs
+++ b/crates/hir/src/semantics.rs
@@ -814,7 +814,7 @@ impl<'a> SemanticsScope<'a> {
                 }
                 resolver::ScopeDef::ImplSelfType(it) => ScopeDef::ImplSelfType(it.into()),
                 resolver::ScopeDef::AdtSelfType(it) => ScopeDef::AdtSelfType(it.into()),
-                resolver::ScopeDef::GenericParam(id) => ScopeDef::GenericParam(TypeParam { id }),
+                resolver::ScopeDef::GenericParam(id) => ScopeDef::GenericParam(id.into()),
                 resolver::ScopeDef::Local(pat_id) => {
                     let parent = resolver.body_owner().unwrap().into();
                     ScopeDef::Local(Local { parent, pat_id })
diff --git a/crates/hir_def/src/resolver.rs b/crates/hir_def/src/resolver.rs
index e7e92c72d..a505bf2be 100644
--- a/crates/hir_def/src/resolver.rs
+++ b/crates/hir_def/src/resolver.rs
@@ -21,8 +21,9 @@ use crate::{
     per_ns::PerNs,
     visibility::{RawVisibility, Visibility},
     AdtId, AssocContainerId, ConstId, ConstParamId, ContainerId, DefWithBodyId, EnumId,
-    EnumVariantId, FunctionId, GenericDefId, HasModule, ImplId, LocalModuleId, Lookup, ModuleDefId,
-    ModuleId, StaticId, StructId, TraitId, TypeAliasId, TypeParamId, VariantId,
+    EnumVariantId, FunctionId, GenericDefId, GenericParamId, HasModule, ImplId, LifetimeParamId,
+    LocalModuleId, Lookup, ModuleDefId, ModuleId, StaticId, StructId, TraitId, TypeAliasId,
+    TypeParamId, VariantId,
 };
 
 #[derive(Debug, Clone, Default)]
@@ -484,7 +485,7 @@ pub enum ScopeDef {
     PerNs(PerNs),
     ImplSelfType(ImplId),
     AdtSelfType(AdtId),
-    GenericParam(TypeParamId),
+    GenericParam(GenericParamId),
     Local(PatId),
 }
 
@@ -527,15 +528,21 @@ impl Scope {
             Scope::LocalItemsScope(body) => body.item_scope.entries().for_each(|(name, def)| {
                 f(name.clone(), ScopeDef::PerNs(def));
             }),
-            Scope::GenericParams { params, def } => {
+            &Scope::GenericParams { ref params, def: parent } => {
                 for (local_id, param) in params.types.iter() {
-                    if let Some(name) = &param.name {
-                        f(
-                            name.clone(),
-                            ScopeDef::GenericParam(TypeParamId { local_id, parent: *def }),
-                        )
+                    if let Some(ref name) = param.name {
+                        let id = TypeParamId { local_id, parent };
+                        f(name.clone(), ScopeDef::GenericParam(id.into()))
                     }
                 }
+                for (local_id, param) in params.consts.iter() {
+                    let id = ConstParamId { local_id, parent };
+                    f(param.name.clone(), ScopeDef::GenericParam(id.into()))
+                }
+                for (local_id, param) in params.lifetimes.iter() {
+                    let id = LifetimeParamId { local_id, parent };
+                    f(param.name.clone(), ScopeDef::GenericParam(id.into()))
+                }
             }
             Scope::ImplDefScope(i) => {
                 f(name![Self], ScopeDef::ImplSelfType(*i));
-- 
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