scope/build: add hints for cargo errors

Regression: cargo errors/warnings are not propagated as expected. This
is a quick fix to let the user know how to see them until #50 is fixed.

Author: tmplt

.ci/expected/manifests/cargo-error.toml

@@ -0,0 +1,42 @@
+[package]
+name = "rtic-parse-test"
+version = "0.0.0"
+authors = ["Viktor Sonesten <[email protected]>"]
+edition = "2018"
+
+[package.metadata.rtic-scope]
+pac_name = "stm32f4"
+pac_features = ["stm32f401"]
+pac_version = "0.13"
+interrupt_path = "stm32f4::stm32f401::Interrupt"
+tpiu_freq = 16000000
+tpiu_baud = 115200
+
+[workspace]
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+embedded-hal = "0.2"
+nb = "1"
+cortex-m = "0.7"
+cortex-m-rt = "0.6"
+panic-halt = "0.2"
+cortex-m-rtic = "=0.6.0-rc.2"
+cortex-m-rtic-trace = { path = "invalid-path" }
+cortex-m-semihosting = "0.3.3"
+
+[dependencies.panic-semihosting]
+features = ["exit"]
+version = "0.5.2"
+
+[dependencies.stm32f4]
+version = "0.13"
+features = ["stm32f401", "rt"]
+
+[dependencies.stm32f4xx-hal]
+version = "0.9"
+features = ["rt", "stm32f401"]
+
+[patch.crates-io]
+cortex-m = { git = "https://github.com/rtic-scope/cortex-m", branch = "feat/tracing" }

.ci/expected/out/cargo-error.run

@@ -0,0 +1,3 @@
+Error `cargo build --bin general` failed with exit status: 101
+Hint Cargo errors/warnings are not properly propagated at the moment (see <https://github.com/rtic-scope/cargo-rtic-scope/issues/50>).
+Hint Manually build your target application with `cargo build` to see eventual errors/warnings.

cargo-rtic-scope/src/build.rs

@@ -51,6 +51,8 @@ impl diag::DiagnosableError for CargoError {
                 "Modify your call so that only one {}-crate is built. Try --bin or --example.",
                 kind
             )],
+            CargoError::CargoBuildExecFailed(_, _) => vec!["Cargo errors/warnings are not properly propagated at the moment (see <https://github.com/rtic-scope/cargo-rtic-scope/issues/50>).".to_string(),
+            "Manually build your target application with `cargo build` to see eventual errors/warnings.".to_string()],
             _ => vec![],
         }
     }