From 627f12868c4c3e714bbb4ce4a418f918c1935dc2 Mon Sep 17 00:00:00 2001 From: Robert Griesemer Date: Thu, 26 Jan 2023 11:22:26 -0800 Subject: [PATCH] go/types, types2: remove misleading example from comment Before this CL, the comment used the case of a recursive generic function call as an example for uni-directional unification. However, such cases are now more generally (and correctly) addressed through renaming of the type parameters. Change-Id: I69e94f53418e1fb4ca9431aeb27c639c40d19b09 Reviewed-on: https://go-review.googlesource.com/c/go/+/463735 Reviewed-by: Robert Findley Run-TryBot: Robert Griesemer Reviewed-by: Robert Griesemer Auto-Submit: Robert Griesemer TryBot-Result: Gopher Robot --- src/cmd/compile/internal/types2/unify.go | 10 +--------- src/go/types/unify.go | 10 +--------- 2 files changed, 2 insertions(+), 18 deletions(-) diff --git a/src/cmd/compile/internal/types2/unify.go b/src/cmd/compile/internal/types2/unify.go index 08508c0e60..381093c574 100644 --- a/src/cmd/compile/internal/types2/unify.go +++ b/src/cmd/compile/internal/types2/unify.go @@ -17,15 +17,7 @@ import ( // provided to the unify call. For unidirectional unification, only // one of these sets (say x) is provided, and then type parameters are // only resolved for the x argument passed to unify, not the y argument -// (even if that also contains possibly the same type parameters). This -// is crucial to infer the type parameters of self-recursive calls: -// -// func f[P any](a P) { f(a) } -// -// For the call f(a) we want to infer that the type argument for P is P. -// During unification, the parameter type P must be resolved to the type -// parameter P ("x" side), but the argument type P must be left alone so -// that unification resolves the type parameter P to P. +// (even if that also contains possibly the same type parameters). // // For bidirectional unification, both sets are provided. This enables // unification to go from argument to parameter type and vice versa. diff --git a/src/go/types/unify.go b/src/go/types/unify.go index 9fb0c75893..206ec69d59 100644 --- a/src/go/types/unify.go +++ b/src/go/types/unify.go @@ -19,15 +19,7 @@ import ( // provided to the unify call. For unidirectional unification, only // one of these sets (say x) is provided, and then type parameters are // only resolved for the x argument passed to unify, not the y argument -// (even if that also contains possibly the same type parameters). This -// is crucial to infer the type parameters of self-recursive calls: -// -// func f[P any](a P) { f(a) } -// -// For the call f(a) we want to infer that the type argument for P is P. -// During unification, the parameter type P must be resolved to the type -// parameter P ("x" side), but the argument type P must be left alone so -// that unification resolves the type parameter P to P. +// (even if that also contains possibly the same type parameters). // // For bidirectional unification, both sets are provided. This enables // unification to go from argument to parameter type and vice versa. -- 2.48.1