[SR-7087] Chaining simple calculations make a too-complex error by the compiler or REPL

[swift-ci]

Previous ID	SR-7087
Radar	None
Original Reporter	mshibanami (JIRA User)
Type	Bug

Attachment: Download

Environment

$swift --version
Apple Swift version 4.1 (swiftlang-902.0.38 clang-902.0.30)
Target: x86_64-apple-darwin17.4.0

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Bug, Performance, TypeChecker
Assignee	@xedin
Priority	Medium

md5: b6131e9d1dd61e2a8934a8d225450e18

Issue Description:

The following expression makes "expression was too complex to be solved in reasonable time" error by REPL or Compiler:

(Optional(1) ?? 1) * 1 * 1 * 1 * 1 * 1 * 1

It looks "Optional(1) ?? 1" part causes this problem.

I don't think this is a expected behavior.So I opened this issue.

See also the attached screen capture.

[belkadan]

Seems in line with some of the others we have. Thanks! @xedin

[xedin]

Indeed operator chaining is currently a weak spot, but we are working on improving it!

[slavapestov]

This is now fast.