Using gtk-rs sourceview crate.
use sourceview::{ File, View, };
gave compile errors saying 'File' not in root. From hint in documentation at
https://gtk-rs.org/docs/sourceview/struct.File.html
I changed Cargo.toml [dependencies] from
sourceview = "0.5.0"
to
sourceview = { version = "0.5.0", features = ["v3_14"] }
and now get errors saying
failed to select a version for 'sourceview'. ... required by package 'foo v0.1.0 (/projects/foo)' versions that meet the requirements '^0.5.0' are: 0.5.0 the package 'foo' depends on 'sourceview', with features: 'v3_14' but 'sourceview' does not have these features.
Not sure how to proceed, grateful for assistance.
The source code is indeed guarded by #[cfg(feature = "v3_14")], but that feature is missing from the manifest:
You should report the issue!
@cuviper: Thanks; I have raised an issue [Issues · gtk-rs/sourceview · GitHub].
Is there any way to temporarily work around it? I've tried editing the manifest in ~/.cargo/registry/src/github.com-1ecc6299db9ec823/sourceview-0.5.0 but it made no difference; possibly the info is cached somewhere: I don't know much about the workings of cargo. 
You can checkout the sourceview repo at the version you need, make your modifications, and then point to it by overriding the dependency:
https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#overriding-dependencies
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OK, now find I need to use version 0.6.0 of 'sourceview'. Trying to compile my project gives this error:
error: failed to select a version for 'sourceview'. ... required by package 'foo v0.1.0 (.../rust/gtk/foo)' versions that meet the requirements '= 0.6.0' are: 0.6.0 the package 'foo' depends on 'sourceview', with features: 'v3_14' but 'sourceview' does not have these features. failed to select a version for 'sourceview' which could resolve this conflict
However, 'sourceview' 0.6.0 does now have that feature, AFAICS.
If I clone the crate:
$ git clone https://github.com/gtk-rs/sourceview.git
and point my Cargo.toml at it:
sourceview = { version = "0.6.0", features = ["v3_14"], path = "../sourceview" }
I then get this:
error: failed to select a version for 'gdk-pixbuf-sys'. ... required by package 'sourceview v0.6.0 (.../rust/gtk/sourceview)' ... which is depended on by 'foo v0.1.0 (../rust/gtk/foo)' versions that meet the requirements '*' are: 0.8.0 the package 'gdk-pixbuf-sys' links to the native library 'gdk_pixbuf', but it conflicts with a previous package which links to 'gdk_pixbuf' as well: package 'gdk-pixbuf-sys v0.8.0' ... which is depended on by 'gtk v0.6.0' ... which is depended on by 'foo v0.1.0 (.../rust/gtk/foo)' failed to select a version for 'gdk-pixbuf-sys' which could resolve this conflict
Have also tried adding
[patch.crates-io] sourceview = { path = "../sourceview" }
to Cargo.toml, but it still gives the same error.
Somewhat confused! 
You're looking at master.
The sourceview repository has tagged commits for each release. git checkout 0.6.0 and you'll see that the feature is missing.
error: failed to select a version for 'gdk-pixbuf-sys'. ... required by package 'sourceview v0.6.0 (.../rust/gtk/sourceview)' ... which is depended on by 'foo v0.1.0 (../rust/gtk/foo)' versions that meet the requirements '*' are:
I'm not entirely sure what's going on there precisely, but somehow two different revisions of gdk-pixbuf-sys are getting pulled into the dependency tree. Looking at the sourceview crate I see lots of plain git dependencies:
...
[dependencies.pango]
git = "https://github.com/gtk-rs/pango"
[dependencies.gtk]
git = "https://github.com/gtk-rs/gtk"
[dependencies.gdk]
git = "https://github.com/gtk-rs/gdk"
[dependencies.cairo-rs]
git = "https://github.com/gtk-rs/cairo"
...
...I cannot fathom why the author did this (git dependencies without tag or rev are a disaster with regards to versioning, and I'm genuinely surprised that cargo publish even allows them!). I'm not saying this must be what's causing this issue, but it is awfully suspicious.
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