Seems like mach bootstrap should have a clobber flag so anyone updating build tool dependencies can force people to re-run mach bootstrap (and save many people frustration).

On 2/26/2019 10:00 AM, David Major wrote:
Does configure warn about this?

The link between this error and needing to bootstrap is not super
clear (and a surprising number of people don't read dev-platform) so
I'm not looking forward to answering the same question in #build for
the rest of the week. :)

On Tue, Feb 26, 2019 at 12:23 PM Emilio Cobos Álvarez <emi...@crisal.io> wrote:

... so if you don't use the mozilla-provided libclang (or are using a
very old one), and you see an error like:

error[E0277]: the trait bound
`values::generics::rect::Rect<values::generics::length::GenericLengthOrNumber<values::computed::length::CSSPixelLength,
f32>>:
std::convert::From<values::generics::rect::Rect<values::generics::length::GenericLengthOrNumber<values::generics::NonNegative<values::computed::length::CSSPixelLength>,

Please re-run mach bootstrap, or update your libclang.

Thanks!

  -- Emilio
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