I got a "Can't type hint a local with a primitive initializer" triggered by
the following fragment of a "let" binding vector:
^BigDecimal d0x (- x (:x rp))
^BigDecimal d0y (- y (:y rp))
d0x2 (- (* d0x d0x) (* d0y d0y))
d0y2 (* 2M (* d0x d0y))
d0x3 (- (* d0x d0x2) (* d0y d0y2))
d0y3 (+ (* d0x d0y2) (* d0y d0x2))
^BigDecimal dx (+ (- (* ax d0x) (* ay d0y))
(- (* bx d0x2) (* by d0y2))
(- (* cx d0x3) (* cy d0y3)))
The error message incorrectly pointed to the start of the enclosing "let"
form as the error location, but it was actually the line starting
^BigDecimal dx ... that it objected to, as evidenced by the removal of that
particular type hint making the message go away. (The cause of the error
was double contamination from ax, ay, bx, by, cx, and cy. A few (bigdec
...) wrappings earlier in the code made it go away.)
By way of contrast, a reflection warning generated by a "(with-precision
m-log" line was much more helpful -- the column number pointed at the start
of the symbol "m-log", and type-hinting m-log's prior declaration with
^Integer made that reflection warning go away.
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