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Robert Griesemer 9ab5154f6c go/types: correctly compute cycle length
The existing algorithm assumed that the length of a cycle was simply
the number of elements in the cycle slice starting at the start object.
However, we use a special "indir" indirection object to indicate
pointer and other indirections that break the inline placement of
types in composite types. These indirection objects don't exist as
true named type objects, so don't count them anymore.

This removes an unnecessary cycle error in one of the existing tests
(testdata/issues.src:100).

Also:
- added more tracing support (only active if tracing is enabled)
- better documentation in parts
- r/check.typ/check.typExpr/ in a few of places where we don't
  need to record a type indirection

Found while investigating #26124.

Change-Id: I45341743225d979a72af3fbecfa05012b32fab67
Reviewed-on: https://go-review.googlesource.com/121755
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
2018-07-10 14:33:10 +00:00
.github .github: use HTTPS for Stack Overflow link in SUPPORT.md 2018-06-12 11:08:14 +00:00
api api: add some more API to go1.11.txt 2018-07-09 21:55:11 +00:00
doc doc: describe modules in Go 1.11 release notes and Go FAQ 2018-07-06 18:42:08 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc syscall/js: add Value.Type 2018-07-09 22:51:14 +00:00
src go/types: correctly compute cycle length 2018-07-10 14:33:10 +00:00
test cmd/compile: make sure alg functions are generated when we call them 2018-07-10 01:20:45 +00:00
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