incorrect and misleading compiler error message

[gopherbot]

by ehog.hedge:

What steps will reproduce the problem?

Compile this code:

(((((((((((((((((((((((((((((((((
package main

type Int struct{value int}

func ok( spoo Int ) {
    _ = Int{1} 
}

func bad( spoo (Int) ) {
    _ = Int{1} 
}
)))))))))))))))))))))))))))

What is the expected output?

Silent (successful) compilation.

What do you see instead?

  main.go:7: cannot parenthesize type in composite literal

Setup:
  GOOS=linux GOARCH=amd64

Which revision are you using?  (hg identify)

  52b9b58d0cfa+ tip

This problem initially revealed itself when the argument types were
more complex -- chan(Int) or [](Int) -- but it's reduceable to just
the (superfluous, at least in this example) bracketing.

Exchanging the two function definition causes the error to additionally
appear inside ok as well as bad.

It /looks/ like the bracketing is being injected into the type at its
first appearance and persists after that.

Chris

[griesemer]

Comment 1:

Owner changed to [email protected].

Status changed to Accepted.

[griesemer]

Comment 2:

Labels changed: added compilerbug.

[rsc]

Comment 3:

Issue #1043 has been merged into this issue.

[rsc]

Comment 4:

This issue was closed by revision b1311cb.

Status changed to Fixed.