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cmd/compile/internal/syntax: compiler directives must start at beginning of line

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- ignore them, if they don't.
- added tests

Fixes #18393.

Change-Id: I13f87b81ac6b9138ab5031bb3dd6bebc4c548156
Reviewed-on: https://go-review.googlesource.com/37020
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Robert Griesemer 2017-02-14 21:34:19 -08:00
parent a8dc43edd1
commit d390283ff4
3 changed files with 35 additions and 9 deletions
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src/cmd/compile/internal/syntax/parser_test.go
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@ -195,7 +195,7 @@ func TestLineDirectives(t *testing.T) {
{`//line :x`, "invalid line number: x", "", 1, 8},
{`//line foo :`, "invalid line number: ", "", 1, 12},
{`//line foo:123abc`, "invalid line number: 123abc", "", 1, 11},
{`/**///line foo:x`, "invalid line number: x", "", 1, 15},
{`/**///line foo:x`, "syntax error: package statement must be first", "", 1, 16}, //line directive not at start of line - ignored
{`//line foo:0`, "invalid line number: 0", "", 1, 11},
{fmt.Sprintf(`//line foo:%d`, lineMax+1), fmt.Sprintf("invalid line number: %d", lineMax+1), "", 1, 11},