More improvements to error messages #349

Job	Run time
tasty-core-nonbootstrapped	1m 12s
scala3-library-nonbootstrapped	59s
scala-library-nonbootstrapped	1m 4s
scala3-library-bootstrapped	3m 47s
scala3-sbt-bridge-nonbootstrapped	2m 53s
tasty-core-bootstrapped	3m 55s
scala3-sbt-bridge-bootstrapped	5m 18s
scala3-compiler-nonbootstrapped	2m 56s
scala3-compiler-bootstrapped	5m 11s
test-scala3-sbt-bridge-nonbootstrapped	3m 4s
scala3-staging	5m 7s
test-tasty-core-nonbootstrapped	1m 7s
scala3-tasty-inspector	5m 31s
test-tasty-core-bootstrapped	3m 52s
test-scala3-sbt-bridge-bootstrapped	5m 42s
scala-library-bootstrapped	3m 33s
	55m 11s

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