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The existing spec rules on package initialization were contradictory: They specified that 1) dependent variables are initialized in dependency order, and 2) independent variables are initialized in declaration order. This 2nd rule cannot be satisfied in general. For instance, for var ( c = b + 2 a = 0 b = 1 ) because of its dependency on b, c must be initialized after b, leading to the partial order b, c. Because a is independent of b but is declared before b, we end up with the order: a, b, c. But a is also independent of c and is declared after c, so the order b, c, a should also be valid in contradiction to a, b, c. The new rules are given in form of an algorithm which outlines initialization order explicitly. gccgo and go/types already follow these rules. Fixes #8485. LGTM=iant, r, rsc R=r, rsc, iant, ken, gordon.klaus, adonovan CC=golang-codereviews https://golang.org/cl/142880043 |
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This is the source code repository for the Go programming language. For documentation about how to install and use Go, visit http://golang.org/ or load doc/install-source.html in your web browser. After installing Go, you can view a nicely formatted doc/install-source.html by running godoc --http=:6060 and then visiting http://localhost:6060/doc/install/source. Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file. -- Binary Distribution Notes If you have just untarred a binary Go distribution, you need to set the environment variable $GOROOT to the full path of the go directory (the one containing this README). You can omit the variable if you unpack it into /usr/local/go, or if you rebuild from sources by running all.bash (see doc/install.html). You should also add the Go binary directory $GOROOT/bin to your shell's path. For example, if you extracted the tar file into $HOME/go, you might put the following in your .profile: export GOROOT=$HOME/go export PATH=$PATH:$GOROOT/bin See doc/install.html for more details.