[dev.typeparams] cmd/compile/internal/types2: better names for things (cleanup)

- use the symbol 𝓤 (as in 𝓤niverse) instead of ⊤ to denote the set
  of all types (for better readabilty, ⊤ is hard to distinguish from
  T in some fonts)

- use isAll instead of isTop to test for the set of all types

- use allTermlist instead of topTermlist to denote the termlist
  representing all types

Change-Id: Idcb0b3398782b38653338e65173c0dbb935e430a
Reviewed-on: https://go-review.googlesource.com/c/go/+/339891
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/cmd/compile/internal/types2/interface.go b/src/cmd/compile/internal/types2/interface.go
index aa7d0b05a0..f763f8ff44 100644
--- a/src/cmd/compile/internal/types2/interface.go
+++ b/src/cmd/compile/internal/types2/interface.go
@@ -92,7 +92,7 @@ func (t *Interface) NumMethods() int { return t.typeSet().NumMethods() }
 func (t *Interface) Method(i int) *Func { return t.typeSet().Method(i) }
 
 // Empty reports whether t is the empty interface.
-func (t *Interface) Empty() bool { return t.typeSet().IsTop() }
+func (t *Interface) Empty() bool { return t.typeSet().IsAll() }
 
 // IsComparable reports whether each type in interface t's type set is comparable.
 func (t *Interface) IsComparable() bool { return t.typeSet().IsComparable() }