Improve calling convention handling when the number of arguments doesn't match the expected number, and the number of return values doesn't match those needed.

src/test/res/compile.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 LUA_HOME=/cygdrive/c/programs/lua5.1
 TESTS="test1 test2 test3 test4 test5"
-#TESTS="test5"
+TESTS="test3"
 for x in $TESTS
 do
     echo compiling $x

src/test/res/test3.lua

@@ -1,6 +1,40 @@
-a = func(1, 2, 3)
-a = func(3, 2, 1)
-a = func(func(),func(),func())
+function f0() print( "f0:" ) end
+function f1(a) print( "f1:", a ) end
+function f2(a,b) print( "f2:", a, b ) end
+function f3(a,b,c) print( "f3:", a, b, c ) end
+function f4(a,b,c,d) print( "f4:", a, b, c, d ) end
 
+f0()  f0( "a1/1" ) f0( "a1/2", "a2/2" ) f0( "a1/3", "a2/3", "a3/3" ) f0( "a1/4", "a2/4", "a3/4", "a4/4" )
+f1()  f1( "a1/1" ) f1( "a1/2", "a2/2" ) f1( "a1/3", "a2/3", "a3/3" ) f1( "a1/4", "a2/4", "a3/4", "a4/4" )
+f2()  f2( "a1/1" ) f2( "a1/2", "a2/2" ) f2( "a1/3", "a2/3", "a3/3" ) f2( "a1/4", "a2/4", "a3/4", "a4/4" )
+f3()  f3( "a1/1" ) f3( "a1/2", "a2/2" ) f3( "a1/3", "a2/3", "a3/3" ) f3( "a1/4", "a2/4", "a3/4", "a4/4" )
+f4()  f4( "a1/1" ) f4( "a1/2", "a2/2" ) f4( "a1/3", "a2/3", "a3/3" ) f4( "a1/4", "a2/4", "a3/4", "a4/4" )
 
+function g0(a,b,c,d) return end
+function g1(a,b,c,d) return d end
+function g2(a,b,c,d) return c, d end
+function g3(a,b,c,d) return b, c, d end
+function g4(a,b,c,d) return a, b, c, d end
+
+z = g0("c0.1/4", "c0.2/4", "c0.3/4", "c0.4/4")
+print( "z0:", z )
+z = g2("c2.1/4", "c2.2/4", "c2.3/4", "c2.4/4")
+print( "z2:", z )
+z = g4("c4.1/4", "c4.2/4", "c4.3/4", "c4.4/4")
+print( "z4:", z )
+
+a,b,c,d = g0( "c0.1/4", "c0.2/4", "c0.3/4", "c0.4/4" )
+print( "g0:", a, b, c, d, "(eol" )
+a,b,c,d = g2( "b2.1/4", "b2.2/4", "b2.3/4", "b2.4/4" )
+print( "g2:", a, b, c, d, "(eol)" )
+a,b,c,d = g4( "b4.1/4", "b4.2/4", "b4.3/4", "b4.4/4" )
+print( "g4:", a, b, c, d, "(eol)" )
+
+function func(a,b,c)
+	return a, b, c
+end
+
+print( func(11, 12, 13) )
+print( func(23, 22, 21) )
+print( func(func(32,33,34), func(45,46,47), func(58,59,50)) )