[COMMITTED] gccrs: Add extra debugging for method call expressions

[Arthur Cohen]

From: Philip Herron <philip.her...@embecosm.com>

gcc/rust/ChangeLog:

        * typecheck/rust-hir-type-check-expr.cc (TypeCheckExpr::visit): Add
        more calls to `rust_debug` for development.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/rust/typecheck/rust-hir-type-check-expr.cc | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/gcc/rust/typecheck/rust-hir-type-check-expr.cc 
b/gcc/rust/typecheck/rust-hir-type-check-expr.cc
index a0eb1a596f7..bea5eb8cb0b 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-expr.cc
+++ b/gcc/rust/typecheck/rust-hir-type-check-expr.cc
@@ -1024,6 +1024,11 @@ TypeCheckExpr::visit (HIR::MethodCallExpr &expr)
       return;
     }
 
+  rust_debug_loc (expr.get_method_name ().get_locus (),
+                 "resolved method to: {%u} {%s}",
+                 candidate.candidate.ty->get_ref (),
+                 candidate.candidate.ty->debug_str ().c_str ());
+
   // Get the adjusted self
   Adjuster adj (receiver_tyty);
   TyTy::BaseType *adjusted_self = adj.adjust_type (candidate.adjustments);
@@ -1120,6 +1125,9 @@ TypeCheckExpr::visit (HIR::MethodCallExpr &expr)
   // apply any remaining generic arguments
   if (expr.get_method_name ().has_generic_args ())
     {
+      rust_debug_loc (expr.get_method_name ().get_generic_args ().get_locus (),
+                     "applying generic arguments to method_call: {%s}",
+                     lookup->debug_str ().c_str ());
       HIR::GenericArgs &args = expr.get_method_name ().get_generic_args ();
       lookup
        = SubstMapper::Resolve (lookup, expr.get_method_name ().get_locus (),
@@ -1129,10 +1137,14 @@ TypeCheckExpr::visit (HIR::MethodCallExpr &expr)
     }
   else if (lookup->needs_generic_substitutions ())
     {
+      rust_debug ("method needs inference: {%s}",
+                 lookup->debug_str ().c_str ());
       lookup = SubstMapper::InferSubst (lookup,
                                        expr.get_method_name ().get_locus ());
     }
 
+  rust_debug ("type-checking method_call: {%s}", lookup->debug_str ().c_str 
());
+
   TyTy::BaseType *function_ret_tyty
     = TyTy::TypeCheckMethodCallExpr::go (lookup, expr, adjusted_self, context);
   if (function_ret_tyty == nullptr
-- 
2.39.1