stage2: fix some generics issues

 * std.meta: correct use of `default_value` in reification. stage1
   accepted a wrong type for `null`.
 * Sema: after instantiating a generic function, if the return type ends
   up being a comptime-known type, then we return an error, undoing the
   generic function instantiation, and making a comptime function call
   instead.
   - We also needed to clean up the dependency graph in this case.
 * Sema: reified enums set tag_ty_inferred to false since an integer tag
   type is provided. This is a limitation of the `@Type` builtin which
   will be addressed with #10710.
 * Sema: fix resolveInferredErrorSet incorrectly calling
   ensureFuncBodyAnalyzed on generic functions.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/Module.zig b/src/Module.zig
index 79d6343949..0666936f1f 100644
--- a/src/Module.zig
+++ b/src/Module.zig
@@ -781,11 +781,11 @@ pub const Decl = struct {
         return &decl_plus_emit_h.emit_h;
     }
 
-    fn removeDependant(decl: *Decl, other: *Decl) void {
+    pub fn removeDependant(decl: *Decl, other: *Decl) void {
         assert(decl.dependants.swapRemove(other));
     }
 
-    fn removeDependency(decl: *Decl, other: *Decl) void {
+    pub fn removeDependency(decl: *Decl, other: *Decl) void {
         assert(decl.dependencies.swapRemove(other));
     }