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Robert Griesemer 435718edd9 cmd/compile/internal/types2: avoid infinite recursion in unification 
If the type T inferred for a type parameter P is P itself (or a derived
type containing P), a subsequent unification step leads to infinite
recursion: at each encounter of P with the already inferred type T
(which is or contains P), P stands for that T and the recursive matching
process continues with T, which inevitably contains P again and recursion
never terminates.

This CL introduces a set of masks, one for each type parameter.
When a type parameter is encountered for which a type has already
been inferred, the type parameter is "masked" for the recursive
matching of the inferred type. Masking makes the type parameter
"invisible" such that it will be handled like any other type and
not unpacked further.

Fixes #48619.
For #48656.

Change-Id: Ic1d938322be51fd44323ea14f925303f58b27c97
Reviewed-on: https://go-review.googlesource.com/c/go/+/352832
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2021-09-28 23:59:17 +00:00
.github
api [dev.fuzz] all: merge master (65f0d24) into dev.fuzz 2021-09-09 09:23:26 -07:00
doc cmd/go: add release note for 'go get' changes 2021-09-28 17:19:19 +00:00
lib/time lib/time: fix RFC 6557 url 2021-08-15 02:18:46 +00:00
misc cmd/cgo: add go:notinheap annotation to Windows handle types 2021-09-22 18:10:24 +00:00
src cmd/compile/internal/types2: avoid infinite recursion in unification 2021-09-28 23:59:17 +00:00
test cmd/compile: keep methods on generic types from being deadcode eliminated 2021-09-27 20:42:34 +00:00
.gitattributes
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS A+C: update name to real name and add to AUTHORS 2021-09-16 23:57:28 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md
CONTRIBUTORS A+C: update name to real name and add to AUTHORS 2021-09-16 23:57:28 +00:00
LICENSE
PATENTS
README.md README: pull gopher image from website 2021-02-16 18:25:10 +00:00
SECURITY.md

README.md

The Go Programming Language

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