diff --git a/vlib/rand/constants/constants.v b/vlib/rand/constants/constants.v
deleted file mode 100644
index 1b2f0bf609..0000000000
--- a/vlib/rand/constants/constants.v
+++ /dev/null
@@ -1,15 +0,0 @@
-module constants
-
-// Commonly used constants across RNGs - some taken from "Numerical Recipes".
-pub const lower_mask = u64(0x00000000FFFFFFFF)
-pub const max_u32 = u32(0xFFFFFFFF)
-pub const max_u64 = u64(0xFFFFFFFFFFFFFFFF)
-pub const u31_mask = u32(0x7FFFFFFF)
-pub const u63_mask = u64(0x7FFFFFFFFFFFFFFF)
-// 23 bits for f32
-pub const ieee754_mantissa_f32_mask = (u32(1) << 23) - 1
-// 52 bits for f64
-pub const ieee754_mantissa_f64_mask = (u64(1) << 52) - 1
-// smallest mantissa with exponent 0 (un normalized)
-pub const reciprocal_2_23rd = 1.0 / f64(u32(1) << 23)
-pub const reciprocal_2_52nd = 1.0 / f64(u64(1) << 52)
diff --git a/vlib/rand/rand.v b/vlib/rand/rand.v
index 3719de57c6..7366ad4d70 100644
--- a/vlib/rand/rand.v
+++ b/vlib/rand/rand.v
@@ -6,7 +6,6 @@ module rand
 
 import math.bits
 import rand.config
-import rand.constants
 import rand.wyrand
 import time
 
@@ -165,13 +164,13 @@ pub fn (mut rng PRNG) i64() i64 {
 // int31 returns a positive pseudorandom 31-bit `int`.
 @[inline]
 pub fn (mut rng PRNG) int31() int {
-	return int(rng.u32() & constants.u31_mask) // Set the 32nd bit to 0.
+	return int(rng.u32() & u32(0x7FFFFFFF)) // Set the 32nd bit to 0.
 }
 
 // int63 returns a positive pseudorandom 63-bit `i64`.
 @[inline]
 pub fn (mut rng PRNG) int63() i64 {
-	return i64(rng.u64() & constants.u63_mask) // Set the 64th bit to 0.
+	return i64(rng.u64() & u64(0x7FFFFFFFFFFFFFFF)) // Set the 64th bit to 0.
 }
 
 // intn returns a pseudorandom `int` in range `[0, max)`.
@@ -221,11 +220,17 @@ pub fn (mut rng PRNG) i64_in_range(min i64, max i64) !i64 {
 	return min + rng.i64n(max - min)!
 }
 
+// smallest mantissa with exponent 0 (un normalized)
+const reciprocal_2_23rd = 1.0 / f64(u32(1) << 23)
+const reciprocal_2_52nd = 1.0 / f64(u64(1) << 52)
+const ieee754_mantissa_f32_mask = (u32(1) << 23) - 1 // 23 bits for f32
+const ieee754_mantissa_f64_mask = (u64(1) << 52) - 1 // 52 bits for f64
+
 // f32 returns a pseudorandom `f32` value in range `[0, 1)`
 // using rng.u32() multiplied by an f64 constant.
 @[inline]
 pub fn (mut rng PRNG) f32() f32 {
-	return f32((rng.u32() >> 9) * constants.reciprocal_2_23rd)
+	return f32((rng.u32() >> 9) * reciprocal_2_23rd)
 }
 
 // f32cp returns a pseudorandom `f32` value in range `[0, 1)`
@@ -258,7 +263,7 @@ pub fn (mut rng PRNG) f32cp() f32 {
 	}
 
 	// Assumes little-endian IEEE floating point.
-	x = (exp << 23) | (x >> 8) & constants.ieee754_mantissa_f32_mask
+	x = (exp << 23) | (x >> 8) & ieee754_mantissa_f32_mask
 	return bits.f32_from_bits(x)
 }
 
@@ -266,7 +271,7 @@ pub fn (mut rng PRNG) f32cp() f32 {
 // using rng.u64() multiplied by a constant.
 @[inline]
 pub fn (mut rng PRNG) f64() f64 {
-	return f64((rng.u64() >> 12) * constants.reciprocal_2_52nd)
+	return f64((rng.u64() >> 12) * reciprocal_2_52nd)
 }
 
 // f64cp returns a pseudorandom `f64` value in range `[0, 1)`
@@ -298,7 +303,7 @@ pub fn (mut rng PRNG) f64cp() f64 {
 	if bitcount > 11 {
 		x = rng.u64()
 	}
-	x = (exp << 52) | (x & constants.ieee754_mantissa_f64_mask)
+	x = (exp << 52) | (x & ieee754_mantissa_f64_mask)
 	return bits.f64_from_bits(x)
 }
 
diff --git a/vlib/v/ast/table.v b/vlib/v/ast/table.v
index 2a62889d71..6de165c4ae 100644
--- a/vlib/v/ast/table.v
+++ b/vlib/v/ast/table.v
@@ -340,7 +340,7 @@ pub fn (t &Table) find_method(s &TypeSymbol, name string) !Fn {
 		}
 		ts = t.type_symbols[ts.parent_idx]
 	}
-	return error('unknown method `${name}`')
+	return error('unknown method')
 }
 
 @[params]
diff --git a/vlib/v/checker/fn.v b/vlib/v/checker/fn.v
index 1c251486c1..8084769fd6 100644
--- a/vlib/v/checker/fn.v
+++ b/vlib/v/checker/fn.v
@@ -2093,6 +2093,9 @@ fn (mut c Checker) method_call(mut node ast.CallExpr, mut continue_check &bool)
 		if final_left_sym.kind == .aggregate {
 			// the error message contains the problematic type
 			unknown_method_msg = err.msg()
+			if unknown_method_msg == 'unknown method' {
+				unknown_method_msg += ' `' + method_name + '`'
+			}
 		}
 	}
 
diff --git a/vlib/v/gen/c/assign.v b/vlib/v/gen/c/assign.v
index fdff9d5dd7..7bffec34f5 100644
--- a/vlib/v/gen/c/assign.v
+++ b/vlib/v/gen/c/assign.v
@@ -1217,17 +1217,18 @@ fn (mut g Gen) gen_cross_tmp_variable(left []ast.Expr, val ast.Expr) {
 		}
 		ast.InfixExpr {
 			sym := g.table.sym(val.left_type)
-			if _ := g.table.find_method(sym, val.op.str()) {
+			svalop := val.op.str()
+			if _ := g.table.find_method(sym, svalop) {
 				left_styp := g.styp(val.left_type.set_nr_muls(0))
 				g.write2(left_styp, '_')
-				g.write2(util.replace_op(val.op.str()), '(')
+				g.write2(util.replace_op(svalop), '(')
 				g.gen_cross_tmp_variable(left, val.left)
 				g.write(', ')
 				g.gen_cross_tmp_variable(left, val.right)
 				g.write(')')
 			} else {
 				g.gen_cross_tmp_variable(left, val.left)
-				g.write(val.op.str())
+				g.write(svalop)
 				g.gen_cross_tmp_variable(left, val.right)
 			}
 		}