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go/types: be robust in the presence of incorrect/missing position info

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Fixes go/loader test crash.

TBR: adonovan

Change-Id: I91dba5e001afa0ee188ccea4db904a6ce744c4d0
Reviewed-on: https://go-review.googlesource.com/11042
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Robert Griesemer 2015-06-12 18:23:47 -07:00
parent e5c3ebe4c7
commit f9379e5b1f
1 changed files with 6 additions and 2 deletions
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8
go/types/resolver.go
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@ -155,8 +155,12 @@ func (check *Checker) collectObjects() {
// Use the actual source file extent rather than *ast.File extent since the
// latter doesn't include comments which appear at the start or end of the file.
f := check.fset.File(file.Pos())
fileScope := NewScope(check.pkg.scope, token.Pos(f.Base()), token.Pos(f.Base()+f.Size()), check.filename(fileNo))
// Be conservative and use the *ast.File extent if we don't have a *token.File.
pos, end := file.Pos(), file.End()
if f := check.fset.File(file.Pos()); f != nil {
pos, end = token.Pos(f.Base()), token.Pos(f.Base()+f.Size())
}
fileScope := NewScope(check.pkg.scope, pos, end, check.filename(fileNo))
check.recordScope(file, fileScope)
for _, decl := range file.Decls {