Remove error handling in parse_type_no_bounds for PLUS token #591
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parse_type_no_bounds tries to be helpful and greedily looks for a PLUS
token after having parsed a typepath so it can produce an error. But
that error breaks parsing expressions that contain "as" Cast
Expressions like "a as usize + b as usize". Drop the explicit error on
seeing a PLUS token and just return the type path parsed.