Fix #1707: Survive non-existing positions in parser #1719
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Previous PR fell short; replaced with a scheme that's more general and thorough. |
odersky
changed the title
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Rebased to master to eliminate that pesky test failure. |
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Indeed, it's actually #1707, |
Some trees, which do not consume input have unassigned positions (so that they can fit in whatever range they are integrated). It's therefore risky to take the start or end of a parsed tree's position. This commit guards against the case where the position of the tree does not exist.
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Test file renamed and rebased to master |
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LGTM @odersky , changes are straight-forward. |
odersky
changed the title
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Some trees, which do not consume input have unassigned positions (so that
they can fit in whatever range they are integrated). It's therefore risky
to take the start or end of a parsed tree's position. This commit guards
against the case where the position of the tree does not exist.
Fixes #1707. Review by @liufengyun