Disable debuginfo in dev builds

Hopefully, this makes printf debugging faster!

.travis.yml

@@ -14,7 +14,6 @@ matrix:
           script:
               - rustup component add rustfmt
               - rustup component add rust-src
-              - sed -i "s/debug = 1/debug = false/g" Cargo.toml
               - cargo test --no-run  # let's measure compile time separately
               - cargo test
           env:

Cargo.toml

@@ -2,7 +2,9 @@
 members = [ "crates/*", "xtask/" ]
 
 [profile.dev]
-debug = 1 # only line info
+# disabling debug info speeds up builds a bunch,
+# and we don't rely on it for debugging that much.
+debug = 0
 
 [profile.release]
 incremental = true