Merge #5378

5378: Thread varargs through rust-analyzer r=flodiebold a=jonas-schievink

This adds a varargs flag to various data structures and fills it from the AST.

Fixes https://github.com/rust-analyzer/rust-analyzer/issues/5374

cc @flodiebold for the typesystem/chalk changes

Co-authored-by: Jonas Schievink <[email protected]>

1 files changed, 9 insertions, 2 deletions

diff --git a/crates/ra_hir_ty/src/display.rs b/crates/ra_hir_ty/src/display.rs
index ac68c5661..c860c254c 100644
--- a/crates/ra_hir_ty/src/display.rs
+++ b/crates/ra_hir_ty/src/display.rs
@@ -243,10 +243,17 @@ impl HirDisplay for ApplicationTy {
                     write!(f, ")")?;
                 }
             }
-            TypeCtor::FnPtr { .. } => {
-                let sig = FnSig::from_fn_ptr_substs(&self.parameters);
+            TypeCtor::FnPtr { is_varargs, .. } => {
+                let sig = FnSig::from_fn_ptr_substs(&self.parameters, is_varargs);
                 write!(f, "fn(")?;
                 f.write_joined(sig.params(), ", ")?;
+                if is_varargs {
+                    if sig.params().is_empty() {
+                        write!(f, "...")?;
+                    } else {
+                        write!(f, ", ...")?;
+                    }
+                }
                 write!(f, ")")?;
                 let ret = sig.ret();
                 if *ret != Ty::unit() {