Improve errors and diagnostics · surface-ui/surface@cbda7bb

test map validate invalid literals at compile-time (Surface.PropertiesTest)

test atom validate invalid atom at compile time (Surface.PropertiesTest)

test list validate invalid literals at compile-time (Surface.PropertiesTest)

test keyword validate invalid literals at compile-time (Surface.PropertiesTest)

test list passing a list without brackets is invalid (Surface.PropertiesTest)

test root property validate if not generator at compile time (Surface.PropertiesTest)

test raise compile error when using :let and there's no default slot defined (Surface.SlotTest)

test raise compile error for invalid arg expression (multiple clauses) (Surface.SlotTest)

test attributes raise on shorthand notation for assigning attributes with invalid expression (Surface.Compiler.ParserTest)

test blocks raise error on blocks without expression (Surface.Compiler.ParserTest)

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